{"id":7593,"date":"2026-08-30T12:24:28","date_gmt":"2026-08-30T03:24:28","guid":{"rendered":"https:\/\/en.kogei-japonica.com\/media\/?p=7593"},"modified":"2026-08-30T12:24:28","modified_gmt":"2026-08-30T03:24:28","slug":"pottery-crazing-flaws","status":"publish","type":"post","link":"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/","title":{"rendered":"Crazing, Iron Spots &#038; Pinholes: Flaw or Character?"},"content":{"rendered":"<p>Have you ever bought a piece by an independent maker, found fine crack-like lines, black dots or tiny holes on the surface, and worried that it might be faulty?<\/p>\n<p>To put it plainly: <b>crazing (kanny\u016b), iron spots (tetsupun or iron flecks), pinholes and the like cannot be judged as &#8220;faulty&#8221; or &#8220;returnable&#8221; simply because they exist.<\/b> In technical terms they are sometimes treated as defects; in other cases they are deliberately incorporated as part of a maker&#8217;s expression, or accepted as the individual variation of a given piece.<\/p>\n<p>In practice, the Pottery Day official site explains that crazing &#8220;is sometimes regarded as a flaw,&#8221; while in other cases it is turned into a deliberate pattern. Toki City, a ceramics-producing area, also gives specific guidance on crazing, iron spots and pinholes as individual variation in handmade ceramics.<\/p>\n<p>Cracks that reach the body of the piece, chips, sharp breakage and leaks are another matter. <b>The fact that a piece is handmade, or made by an independent maker, does not mean you have to accept problems that affect its use.<\/b><\/p>\n<p>This article sorts things into three tiers\u2014<b>&#8220;likely no problem,&#8221; &#8220;worth checking with the maker or shop,&#8221; and &#8220;stop using&#8221;<\/b>\u2014so that even first-time buyers of maker&#8217;s pieces can judge with confidence, setting out the difference between crazing, black spots, pinholes, ishihaze and glaze unevenness on the one hand, and the breakage genuinely worth watching for on the other.<\/p>\n<div class=\"linkcard\"><div class=\"lkc-internal-wrap\"><a class=\"lkc-link no_icon\" href=\"https:\/\/en.kogei-japonica.com\/media\/skills\/ceramics\/\"><div class=\"lkc-card\"><div class=\"lkc-info\"><img decoding=\"async\" class=\"lkc-favicon\" src=\"https:\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2025\/06\/cropped-logo_ver1-32x32.webp\" alt=\"\" width=\"16\" height=\"16\" \/><div class=\"lkc-domain\">en.kogei-japonica.com\/media<\/div><\/div><div class=\"lkc-content\"><figure class=\"lkc-thumbnail\"><img decoding=\"async\" class=\"lkc-thumbnail-img\" src=\"\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2026\/01\/ceramics.webp\" width=\"100px\" height=\"108px\" alt=\"\" \/><\/figure><div class=\"lkc-title\">Ceramics Explained: A Comprehensive Guide from Materials and Firing to Decora...<\/div><div class=\"lkc-url\" title=\"https:\/\/en.kogei-japonica.com\/media\/skills\/ceramics\/\">https:\/\/en.kogei-japonica.com\/media\/skills\/ceramics\/<\/div><div class=\"lkc-excerpt\">Ceramics, crafted from clay and stone through processes of forming, firing, and decoration, represent one of humanity&#039;s oldest craft traditions. Classified into earthenware, porcelain, and stoneware based on clay properties and firing temperatures, each type differs in texture, strength, and application.Furthermore, the choice of glazes, decorative techniques, and firing methods dramatically alters their appearance, with each production region developing its own unique aesthetic sensibil...<\/div><\/div><div class=\"clear\">\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div><\/a><\/div><\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Are_Crazing_Iron_Spots_and_Pinholes_Defects_Start_With_Three_Tiers\" title=\"Are Crazing, Iron Spots and Pinholes Defects? Start With Three Tiers\">Are Crazing, Iron Spots and Pinholes Defects? Start With Three Tiers<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#%E2%97%8B_Conditions_That_Are_Likely_No_Problem\" title=\"\u25cb Conditions That Are Likely No Problem\">\u25cb Conditions That Are Likely No Problem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#%E2%96%B3_Conditions_Worth_Checking_With_the_Maker_or_Shop\" title=\"\u25b3 Conditions Worth Checking With the Maker or Shop\">\u25b3 Conditions Worth Checking With the Maker or Shop<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#%C3%97_Conditions_Where_It_Is_Better_to_Stop_Using\" title=\"\u00d7 Conditions Where It Is Better to Stop Using\">\u00d7 Conditions Where It Is Better to Stop Using<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#What_Is_Crazing_A_%E2%80%9CCrack_in_the_Glaze%E2%80%9D_Is_Not_the_Same_as_a_Crack_in_the_Body\" title=\"What Is Crazing? A &#8220;Crack in the Glaze&#8221; Is Not the Same as a Crack in the Body\">What Is Crazing? A &#8220;Crack in the Glaze&#8221; Is Not the Same as a Crack in the Body<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Why_Does_Crazing_Form\" title=\"Why Does Crazing Form?\">Why Does Crazing Form?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#How_Do_You_Tell_Crazing_From_a_Real_Crack\" title=\"How Do You Tell Crazing From a Real Crack?\">How Do You Tell Crazing From a Real Crack?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Can_Crazing_Increase_After_Purchase\" title=\"Can Crazing Increase After Purchase?\">Can Crazing Increase After Purchase?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Black_Spots_Pinholes_Ishihaze_and_Glaze_Unevenness%E2%80%94What_Is_the_Difference\" title=\"Black Spots, Pinholes, Ishihaze and Glaze Unevenness\u2014What Is the Difference?\">Black Spots, Pinholes, Ishihaze and Glaze Unevenness\u2014What Is the Difference?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Black_Spots_and_Iron_Flecks\" title=\"Black Spots and Iron Flecks\">Black Spots and Iron Flecks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Pinholes\" title=\"Pinholes\">Pinholes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Ishihaze\" title=\"Ishihaze\">Ishihaze<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Glaze_Unevenness_Running_and_Colour_Variation\" title=\"Glaze Unevenness, Running and Colour Variation\">Glaze Unevenness, Running and Colour Variation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Marks_Born_of_the_Making_Process_Such_as_Spur_Marks\" title=\"Marks Born of the Making Process, Such as Spur Marks\">Marks Born of the Making Process, Such as Spur Marks<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Where_Should_You_Draw_the_Line_Between_%E2%80%9CLandscape%E2%80%9D_and_%E2%80%9CDefect%E2%80%9D\" title=\"Where Should You Draw the Line Between &#8220;Landscape&#8221; and &#8220;Defect&#8221;?\">Where Should You Draw the Line Between &#8220;Landscape&#8221; and &#8220;Defect&#8221;?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Makers_Pieces_Cannot_Be_Judged_by_the_Same_Uniformity_as_Industrial_Products\" title=\"Maker&#8217;s Pieces Cannot Be Judged by the Same Uniformity as Industrial Products\">Maker&#8217;s Pieces Cannot Be Judged by the Same Uniformity as Industrial Products<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Even_So_Dont_Settle_Everything_With_%E2%80%9CIts_Handmade%E2%80%9D\" title=\"Even So, Don&#8217;t Settle Everything With &#8220;It&#8217;s Handmade&#8221;\">Even So, Don&#8217;t Settle Everything With &#8220;It&#8217;s Handmade&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#What_%E2%80%9CIndividual_Variation%E2%80%9D_Makers_and_Shops_Should_Explain\" title=\"What &#8220;Individual Variation&#8221; Makers and Shops Should Explain\">What &#8220;Individual Variation&#8221; Makers and Shops Should Explain<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#What_Should_You_Check_Before_Discussing_a_Return_or_Exchange\" title=\"What Should You Check Before Discussing a Return or Exchange?\">What Should You Check Before Discussing a Return or Exchange?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Review_the_Original_Product_Description\" title=\"Review the Original Product Description\">Review the Original Product Description<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Check_Whether_It_Was_Before_or_After_Use\" title=\"Check Whether It Was Before or After Use\">Check Whether It Was Before or After Use<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Photograph_From_Four_Angles\" title=\"Photograph From Four Angles\">Photograph From Four Angles<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Items_to_Convey_When_Enquiring_to_the_Shop\" title=\"Items to Convey When Enquiring to the Shop\">Items to Convey When Enquiring to the Shop<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Five_Things_to_Check_Next_Time_You_Buy_Online\" title=\"Five Things to Check Next Time You Buy Online\">Five Things to Check Next Time You Buy Online<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#To_Use_a_Piece_for_a_Long_Time_How_Should_You_Handle_It_After_Purchase\" title=\"To Use a Piece for a Long Time, How Should You Handle It After Purchase?\">To Use a Piece for a Long Time, How Should You Handle It After Purchase?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Follow_the_Makers_or_Manufacturers_Instructions_First\" title=\"Follow the Maker&#8217;s or Manufacturer&#8217;s Instructions First\">Follow the Maker&#8217;s or Manufacturer&#8217;s Instructions First<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Dry_Thoroughly_After_Washing\" title=\"Dry Thoroughly After Washing\">Dry Thoroughly After Washing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#Dont_Rule_on_Microwave_and_Dishwasher_Use_Uniformly\" title=\"Don&#8217;t Rule on Microwave and Dishwasher Use Uniformly\">Don&#8217;t Rule on Microwave and Dishwasher Use Uniformly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#If_You_Notice_a_Crack_Chip_or_Leak_Dont_Keep_Using_It\" title=\"If You Notice a Crack, Chip or Leak, Don&#8217;t Keep Using It\">If You Notice a Crack, Chip or Leak, Don&#8217;t Keep Using It<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/pottery-crazing-flaws\/#FAQ%EF%BD%9CQuestions_About_Crazing_Black_Spots_and_Pinholes\" title=\"FAQ\uff5cQuestions About Crazing, Black Spots and Pinholes\">FAQ\uff5cQuestions About Crazing, Black Spots and Pinholes<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Are_Crazing_Iron_Spots_and_Pinholes_Defects_Start_With_Three_Tiers\"><\/span>Are Crazing, Iron Spots and Pinholes Defects? Start With Three Tiers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><iframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/48Mcy64zGQA?si=S3Fg5890Keroq1Lb\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p><b>The surface of a fired piece carries many changes born of making and firing, and you cannot decide from appearance alone whether something is faulty. Start by sorting it into three tiers: no problem, worth checking, stop using.<\/b><\/p>\n<p>When you find something that bothers you on a piece, thinking of it as a straight either\/or\u2014&#8221;is this character, or a fault?&#8221;\u2014makes the judgement harder.<\/p>\n<p>The first thing to check is not whether it looks beautiful, but <b>whether it affects the piece&#8217;s function, whether it was part of the condition you could expect at purchase, and whether it has changed during use.<\/b><\/p>\n<div class=\"scroll_table\">\n<table>\n<thead>\n<tr>\n<th>Verdict<\/th>\n<th>Typical conditions<\/th>\n<th>What to check<\/th>\n<th>Basic response<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><b>\u25cb Likely no problem<\/b><\/td>\n<td>Crazing, iron flecks and slight glaze unevenness consistent with the intent or product description<\/td>\n<td>Whether it was there from purchase, and whether it affects use<\/td>\n<td>Use in line with the piece&#8217;s or seller&#8217;s guidance<\/td>\n<\/tr>\n<tr>\n<td><b>\u25b3 Worth checking<\/b><\/td>\n<td>Holes of unknown depth, ishihaze-like flaking, changes that have spread after use, and so on<\/td>\n<td>Sharpness, depth, water seepage, difference from the product description<\/td>\n<td>Check with the maker or shop, with photos attached<\/td>\n<\/tr>\n<tr>\n<td><b>\u00d7 Stop using<\/b><\/td>\n<td>Clear cracks, chips, sharp breakage, leaks and the like<\/td>\n<td>Whether a crack has reached the body of the piece<\/td>\n<td>Stop using and consult the seller<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Note that &#8220;\u25cb&#8221; does not mean every instance of the same-named phenomenon is guaranteed safe. Even for the same pinhole, the judgement changes with size, depth, position and the intended use of the piece.<\/p>\n<p>From the standpoint of ceramics technology, moreover, crazing, pinholes and the like are sometimes the subject of research and countermeasures as &#8220;ceramic defects.&#8221; Toki City&#8217;s ceramics testing station, Cerateching Toki, also organises the various phenomena that arise during firing as &#8220;ceramic defects.&#8221;<br \/>\n(Source: <a href=\"https:\/\/www.city.toki.lg.jp\/sangyo\/sangyo\/1004876\/1006413\/1002172.html\" rel=\"noopener nofollow\" target=\"_blank\">\u9676\u78c1\u5668\u306e\u6b20\u9665\uff08\u539f\u56e0\u3068\u5bfe\u7b56\uff09\uff5c\u571f\u5c90\u5e02<\/a>)<\/p>\n<p>What we do not want to confuse here is that <b>a &#8220;defect&#8221; in ceramics technology and a &#8220;faulty, returnable product&#8221; for the consumer do not necessarily mean the same thing.<\/b> As with deliberate crackle glaze (kanny\u016b-y\u016b), some works actively use, as expression, a phenomenon that would normally be something to suppress.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E2%97%8B_Conditions_That_Are_Likely_No_Problem\"><\/span>\u25cb Conditions That Are Likely No Problem<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Crazing, iron flecks, and variation in the depth of the glaze (y\u016byaku) that are described as part of the work&#8217;s specification do not, in themselves, signify breakage.<\/p>\n<p>Toki City likewise notes that ceramics made by hand may show, besides differences in size, shape and pattern, crazing, variation in glaze depth, iron spots and pinholes.<br \/>\n(Source: <a href=\"https:\/\/www.city.toki.lg.jp\/shisei\/zaisei\/1004975\/1004422.html\" rel=\"noopener nofollow\" target=\"_blank\">\u9676\u78c1\u5668\u306e\u500b\u4f53\u5dee\uff5c\u571f\u5c90\u5e02<\/a>)<\/p>\n<p>That said, this does not mean &#8220;crazing, black spots and small holes on any piece are fine.&#8221; <b>The first step is to check whether it is a characteristic anticipated for that maker or that product.<\/b><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E2%96%B3_Conditions_Worth_Checking_With_the_Maker_or_Shop\"><\/span>\u25b3 Conditions Worth Checking With the Maker or Shop<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You are under no obligation to force a condition you cannot judge on sight into the category of &#8220;landscape&#8221; yourself.<\/p>\n<ul>\n<li>A hole or hollow that is deeper than expected<\/li>\n<li>A surface that looks about to flake away<\/li>\n<li>A raised part that feels sharp<\/li>\n<li>A crack-like line that has changed markedly since purchase<\/li>\n<li>A line that bothers you at the same spot on both the inside and outside of the piece<\/li>\n<li>Seepage to the outside when you put water in<\/li>\n<li>A clear difference from the individual variation described on the product page<\/li>\n<\/ul>\n<p>In cases like these, checking with the seller before continuing to use the piece is the surer course.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%C3%97_Conditions_Where_It_Is_Better_to_Stop_Using\"><\/span>\u00d7 Conditions Where It Is Better to Stop Using<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Where there is a clear crack, chip or heavy damage, judge it separately from &#8220;character&#8221; or &#8220;change over time.&#8221;<\/p>\n<p>The Pottery Day official site also advises against using pottery with cracks, chips or heavy scuffs, since it can break unexpectedly.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/usage\/others\" rel=\"noopener nofollow\" target=\"_blank\">\u305d\u306e\u4ed6\u306e\u5546\u54c1\u30fb\u9676\u5668\u306e\u6271\u3044\u65b9\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/p>\n<p><b>Respecting a maker&#8217;s expression and judging whether a piece is safe to use are two different questions.<\/b> Not blurring this line matters for both maker and user.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Crazing_A_%E2%80%9CCrack_in_the_Glaze%E2%80%9D_Is_Not_the_Same_as_a_Crack_in_the_Body\"><\/span>What Is Crazing? A &#8220;Crack in the Glaze&#8221; Is Not the Same as a Crack in the Body<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div style=\"max-width:300px; margin:0 auto 15px;\"><iframe width=\"485\" height=\"862\" src=\"https:\/\/www.youtube.com\/embed\/QMgoNk-ipG4\" title=\"Cracks in pottery\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p><b>Crazing is a network of fine cracks that appears mainly on the surface of the glaze. It differs in meaning from a crack in the body of the piece, which breaks through to the clay body (kiji), and it is sometimes taken up deliberately as expression.<\/b><\/p>\n<p>Crazing is what most surprises first-time buyers of maker&#8217;s pieces into thinking &#8220;surely this is cracked.&#8221;<\/p>\n<p>The Pottery Day official site describes crazing as &#8220;cracks appearing on the glaze surface,&#8221; arising from the difference in shrinkage rate between the clay body and the glaze. It also notes that while it is sometimes regarded as a flaw, in other cases it has been turned deliberately into a pattern.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/glossary\" rel=\"noopener nofollow\" target=\"_blank\">\u7528\u8a9e\u8f9e\u5178\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/p>\n<p>This is the important point. <b>&#8220;Crazing equals faulty&#8221; is no more true than &#8220;crazing is always fine.&#8221;<\/b> You need to consider the full context\u2014the maker&#8217;s intent, the use of the piece, and any change during use.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_Does_Crazing_Form\"><\/span>Why Does Crazing Form?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In pottery, a formed clay body is coated with glaze and fired at high temperature. The glaze melts in firing and, on cooling, becomes a glassy layer covering the surface of the piece.<\/p>\n<p>At this stage, the clay body and the glaze do not necessarily have exactly the same properties of thermal expansion and contraction. Differences such as these create stress in the glaze layer, and what appears as fine cracks is crazing.<\/p>\n<p>Kogei Japonica&#8217;s foundational article explains the workings of glaze and firing in more detail.<\/p>\n<div class=\"linkcard\"><div class=\"lkc-internal-wrap\"><a class=\"lkc-link no_icon\" href=\"https:\/\/en.kogei-japonica.com\/media\/skills\/glaze-firing\/\"><div class=\"lkc-card\"><div class=\"lkc-info\"><img decoding=\"async\" class=\"lkc-favicon\" src=\"https:\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2025\/06\/cropped-logo_ver1-32x32.webp\" alt=\"\" width=\"16\" height=\"16\" \/><div class=\"lkc-domain\">en.kogei-japonica.com\/media<\/div><\/div><div class=\"lkc-content\"><figure class=\"lkc-thumbnail\"><img decoding=\"async\" class=\"lkc-thumbnail-img\" src=\"\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2026\/03\/Glaze.webp\" width=\"100px\" height=\"108px\" alt=\"\" \/><\/figure><div class=\"lkc-title\">Japanese Pottery Glazes &amp; Firing: The Science of Ceramics<\/div><div class=\"lkc-url\" title=\"https:\/\/en.kogei-japonica.com\/media\/skills\/glaze-firing\/\">https:\/\/en.kogei-japonica.com\/media\/skills\/glaze-firing\/<\/div><div class=\"lkc-excerpt\">When admiring traditional Japanese ceramics, the profound colors and intricate patterns are not merely painted on; they are the result of dramatic chemical reactions born from earth, minerals, and fire. Understanding the foundational science of Japanese pottery glazes and firing techniques transforms how you appreciate these masterpieces. This guide explores the mechanics of oxidation and reduction firing, revealing how elements like iron and copper create vibrant colors. Beyond perfect contr...<\/div><\/div><div class=\"clear\">\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div><\/a><\/div><\/div>\n<h3><span class=\"ez-toc-section\" id=\"How_Do_You_Tell_Crazing_From_a_Real_Crack\"><\/span>How Do You Tell Crazing From a Real Crack?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>It can be hard for an ordinary buyer to tell crazing from a structural crack with certainty from a photograph or appearance alone.<\/p>\n<p>So avoid quick assumptions such as &#8220;a net pattern must be crazing&#8221; or &#8220;a single line must be breakage.&#8221;<\/p>\n<p>The following are useful points of reference for checking.<\/p>\n<ul>\n<li>Whether the fine lines appear on the glaze surface only<\/li>\n<li>Whether a large crack is visible at the same place on both the inside and outside of the piece<\/li>\n<li>Whether you can feel a step or a sharp catch when you run a finger over it<\/li>\n<li>Whether the shape of the piece is offset across the crack<\/li>\n<li>Whether there is any functional change such as leaking<\/li>\n<li>Whether crazing was noted in the product description at purchase<\/li>\n<\/ul>\n<p>In the trade in antiques, old art and ceramics, a crack in the body is sometimes called ny\u016b, and a chip at the rim or elsewhere hotsu. But an ordinary buyer has no need to diagnose a condition from terminology alone. <b>If there is a clear crack or chip, prioritise stopping use and checking, whatever it is called.<\/b><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_Crazing_Increase_After_Purchase\"><\/span>Can Crazing Increase After Purchase?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Crazing that was not conspicuous at purchase can become more noticeable with the passage of time or the conditions of use.<\/p>\n<p>The Pottery Day official site notes that when moisture is absorbed into the clay body from the base during use or storage, age-crazing can occur early in the glaze and become a cause of leaking and the like.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/usage\/others\" rel=\"noopener nofollow\" target=\"_blank\">\u305d\u306e\u4ed6\u306e\u5546\u54c1\u30fb\u9676\u5668\u306e\u6271\u3044\u65b9\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/p>\n<p>In other words, you cannot rule uniformly that &#8220;a line appeared after purchase, so it is immediately faulty,&#8221; nor that &#8220;it is crazing, so it can be left alone.&#8221;<\/p>\n<p>If a line grows quickly, if leaking occurs, or if a deep crack in the body is suspected, stop using the piece and consult the maker or seller.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Black_Spots_Pinholes_Ishihaze_and_Glaze_Unevenness%E2%80%94What_Is_the_Difference\"><\/span>Black Spots, Pinholes, Ishihaze and Glaze Unevenness\u2014What Is the Difference?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>The black spots, small holes, unevenness and colour variation seen on a piece each have a different background. Even when they look alike, it matters not to lump them all together as &#8220;only to be expected from pottery.&#8221;<\/b><\/p>\n<p>Depending on the clay and glaze, kiln conditions, and the conditions of glazing (sey\u016b) and firing, various changes appear on the surface of a piece.<\/p>\n<p>Here we sort out the conditions that buyers of maker&#8217;s pieces find hardest to judge.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Black_Spots_and_Iron_Flecks\"><\/span>Black Spots and Iron Flecks<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>On white or pale pieces, small black or brown spots can stand out.<\/p>\n<p>Toki City explains, as part of the individual variation of handmade ceramics, that iron contained in the clay can appear as small black spots on the surface through firing.<br \/>\n(Source: <a href=\"https:\/\/www.city.toki.lg.jp\/shisei\/zaisei\/1004975\/1004422.html\" rel=\"noopener nofollow\" target=\"_blank\">\u9676\u78c1\u5668\u306e\u500b\u4f53\u5dee\uff5c\u571f\u5c90\u5e02<\/a>)<\/p>\n<p>Even so, <b>you cannot tell from appearance alone that a black spot means &#8220;it&#8217;s iron, so it&#8217;s fine&#8221; or &#8220;it isn&#8217;t mould.&#8221;<\/b> Black spots on ceramics can have several origins in the raw materials or the manufacturing process, and it is difficult to identify the substance from appearance alone at home.<\/p>\n<p>If the black spot has been present since purchase, as though fired into the glaze surface, first check the product description. Where blackening has appeared after use, or where the surface condition or smell has changed, do not treat it as the same thing as firing-derived iron flecks; check the state of washing and drying.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pinholes\"><\/span>Pinholes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A pinhole is a small hole or dimple that forms in the glaze surface.<\/p>\n<p>The Pottery Day official site explains that pinholes arise from various causes, such as gas given off by the body or glaze during firing, or dust that settled before the glaze was applied.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/glossary\" rel=\"noopener nofollow\" target=\"_blank\">\u7528\u8a9e\u8f9e\u5178\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/p>\n<p>Toki City likewise notes, as one example of the individual variation of handmade ceramics, that small pinholes may be seen on the glaze surface.<br \/>\n(Source: <a href=\"https:\/\/www.city.toki.lg.jp\/shisei\/zaisei\/1004975\/1004422.html\" rel=\"noopener nofollow\" target=\"_blank\">\u9676\u78c1\u5668\u306e\u500b\u4f53\u5dee\uff5c\u571f\u5c90\u5e02<\/a>)<\/p>\n<p>A single pinhole is not, by itself, enough for a consumer to conclude that a piece is defective, returnable or unusable.<\/p>\n<p>On the other hand, if the hole is large or deep enough to trap food, flaking around it, or with a sharp part, it is better to check with the seller.<\/p>\n<p>Note that food-use ceramics are subject to standards for utensils and packaging under Japan&#8217;s Food Sanitation Act, and the Consumer Affairs Agency publishes the current standards and materials on revisions to the cadmium and lead standards. But <b>the standards for the leaching of lead, cadmium and the like are a separate issue from the presence of a pinhole.<\/b> Take care not to conclude food-use safety from appearance alone.<br \/>\n(Source: <a href=\"https:\/\/www.caa.go.jp\/policies\/policy\/standards_evaluation\/appliance\" rel=\"noopener nofollow\" target=\"_blank\">\u5668\u5177\u30fb\u5bb9\u5668\u5305\u88c5\u3001\u304a\u3082\u3061\u3083\u3001\u6d17\u6d44\u5264\uff5c\u6d88\u8cbb\u8005\u5e81<\/a>)<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ishihaze\"><\/span>Ishihaze<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In pottery descriptions, the word &#8220;ishihaze&#8221; is sometimes used.<\/p>\n<p>It generally refers to a localised swelling or flake-like expression arising from particles contained in the clay, but <b>you should not judge a piece&#8217;s condition or usability from the term &#8220;ishihaze&#8221; alone.<\/b><\/p>\n<p>While it is accepted as expression on some pieces, if the protrusion is sharp, the surface looks about to flake, or a piece has come away during use, check with the seller whatever the name.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Glaze_Unevenness_Running_and_Colour_Variation\"><\/span>Glaze Unevenness, Running and Colour Variation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Glaze does not always form a perfectly even surface the way ordinary paint does.<\/p>\n<p>Depending on the thickness of the glazing, the shape of the piece and the firing conditions, variation in colour, running of the glaze and differences in sheen can arise. Toki City also notes that variation can appear according to how the glaze takes and how it fires.<br \/>\n(Source: <a href=\"https:\/\/www.city.toki.lg.jp\/shisei\/zaisei\/1004975\/1004422.html\" rel=\"noopener nofollow\" target=\"_blank\">\u9676\u78c1\u5668\u306e\u500b\u4f53\u5dee\uff5c\u571f\u5c90\u5e02<\/a>)<\/p>\n<p>Some makers deliberately incorporate these variations into the work&#8217;s expression.<\/p>\n<p><b>Unevenness in itself does not immediately signify a fault. But being handmade does not, of itself, justify every possible condition either.<\/b><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Marks_Born_of_the_Making_Process_Such_as_Spur_Marks\"><\/span>Marks Born of the Making Process, Such as Spur Marks<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Pottery can retain marks arising from firing and the making process. A buyer may perceive marks seen on the underside or inside of a piece as &#8220;damage.&#8221;<\/p>\n<p>What matters is to distinguish whether such a mark is something anticipated in the making process, or damage caused by delivery, storage or use.<\/p>\n<p>If you are unsure, do not decide &#8220;defect&#8221; or &#8220;landscape&#8221; from a photograph alone; check the product description or the guidance from the maker or seller.<\/p>\n<div class=\"linkcard\"><div class=\"lkc-internal-wrap\"><a class=\"lkc-link no_icon\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/handmade-japanese-tableware\/\"><div class=\"lkc-card\"><div class=\"lkc-info\"><img decoding=\"async\" class=\"lkc-favicon\" src=\"https:\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2025\/06\/cropped-logo_ver1-32x32.webp\" alt=\"\" width=\"16\" height=\"16\" \/><div class=\"lkc-domain\">en.kogei-japonica.com\/media<\/div><\/div><div class=\"lkc-content\"><figure class=\"lkc-thumbnail\"><img decoding=\"async\" class=\"lkc-thumbnail-img\" src=\"\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2026\/03\/japanese-tableware-1.webp\" width=\"100px\" height=\"108px\" alt=\"\" \/><\/figure><div class=\"lkc-title\">An Expert Guide to Artisan-Made Japanese Tableware: Elevating Your Daily Dining<\/div><div class=\"lkc-url\" title=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/handmade-japanese-tableware\/\">https:\/\/en.kogei-japonica.com\/media\/crafts\/handmade-japanese-tableware\/<\/div><div class=\"lkc-excerpt\">Artisan-made Japanese tableware has the ability to bring a sense of richness to daily life simply by serving as a vessel for your everyday meals.However, for international designers and new readers drawn to Japanese aesthetics and the value of handcraft, selecting that first piece can feel somewhat intimidating.In this article, drawing on Kogei Japonica&#039;s specialized knowledge and factual research, we explain the key points for choosing vessels that fit naturally into your lifestyle.Rath...<\/div><\/div><div class=\"clear\">\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div><\/a><\/div><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Where_Should_You_Draw_the_Line_Between_%E2%80%9CLandscape%E2%80%9D_and_%E2%80%9CDefect%E2%80%9D\"><\/span>Where Should You Draw the Line Between &#8220;Landscape&#8221; and &#8220;Defect&#8221;?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>In craft, changes born of clay, glaze, flame and the making process are sometimes valued as the expression of a work. But aesthetic value and whether a piece functions properly as a vessel are separate axes.<\/b><\/p>\n<p>In explanations from shops and makers that deal in pottery, you will sometimes see the word keshiki, literally &#8220;landscape&#8221;\u2014a term for the expressive surface effects produced through firing.<\/p>\n<p>It is an important idea in the context of appreciating the expressions born of firing\u2014the running of glaze, changes of colour, kiln transformation (y\u014dhen), crazing and so on.<\/p>\n<p>But if every condition a buyer feels uncertain about is explained away with the single phrase &#8220;it&#8217;s landscape,&#8221; the functional problems that ought to be checked become invisible too.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Makers_Pieces_Cannot_Be_Judged_by_the_Same_Uniformity_as_Industrial_Products\"><\/span>Maker&#8217;s Pieces Cannot Be Judged by the Same Uniformity as Industrial Products<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>With maker&#8217;s pieces, some works are not intended to match perfectly in dimensions, colour or surface finish.<\/p>\n<p>Even in the same series by the same maker, the expression of each single piece can change with the thickness of the glaze, the position in the kiln and the firing environment.<\/p>\n<p>One of the appeals of choosing maker&#8217;s pieces is not simply &#8220;tolerating variation.&#8221;<\/p>\n<p><b>Part of the appeal is choosing one particular piece, the differences born of material and making process included.<\/b><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Even_So_Dont_Settle_Everything_With_%E2%80%9CIts_Handmade%E2%80%9D\"><\/span>Even So, Don&#8217;t Settle Everything With &#8220;It&#8217;s Handmade&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>At the same time, the words &#8220;handmade,&#8221; &#8220;one of a kind&#8221; and &#8220;individual variation&#8221; should not be used to shut down a buyer&#8217;s questions.<\/p>\n<div class=\"box3\">\n<p><b>Editor&#8217;s Note\uff5c&#8221;Landscape&#8221; Is Not a Free Pass<\/b><\/p>\n<p>Introducing craft makers and their work, I feel that the words &#8220;landscape,&#8221; &#8220;one of a kind&#8221; and &#8220;unique to handwork,&#8221; while very handy for conveying a work&#8217;s appeal, can also become words that paper over a lack of explanation.<\/p>\n<p>With the same crazing or iron flecks, there are makers who want to show them actively, and makers who adjust glaze and firing to suppress them as far as possible. In other words, whether to embrace a particular variation as part of the work&#8217;s keshiki is itself part of a maker&#8217;s aesthetic and design.<\/p>\n<p>That is why lumping things together as &#8220;this much is only to be expected from pottery&#8221; is not only insufficient as an explanation to buyers; it also obscures the differences in intent and technique from one maker to the next.<\/p>\n<p><b>Respecting the individual variation of craft and being vague about the conditions that ought to be checked in a vessel are two different things.<\/b> The axis of &#8220;landscape&#8221; carries meaning only when maker and user can share concrete reasons.<\/p>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"What_%E2%80%9CIndividual_Variation%E2%80%9D_Makers_and_Shops_Should_Explain\"><\/span>What &#8220;Individual Variation&#8221; Makers and Shops Should Explain<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In online sales especially, buyers cannot pick up the actual piece to check it.<\/p>\n<p>Rather than writing only &#8220;there is individual variation because it is handmade&#8221; on the product page, presenting the following information concretely reduces mismatches in understanding.<\/p>\n<ul>\n<li>Whether crazing is present<\/li>\n<li>The possibility of black spots or iron flecks appearing<\/li>\n<li>How pinholes are handled<\/li>\n<li>The range of glaze colour and variation<\/li>\n<li>Individual variation in dimensions and shape<\/li>\n<li>Whether prior treatment such as sealing (me-dome) is needed<\/li>\n<li>Whether microwaves, dishwashers and the like may be used<\/li>\n<li>Examples of breakage or change for which enquiry is recommended<\/li>\n<\/ul>\n<p>Such explanations do not protect only the buyer.<\/p>\n<p>For the maker too, they are <b>an important part of product communication that prevents a work&#8217;s true characteristics from being mistaken for a &#8220;defect.&#8221;<\/b><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Should_You_Check_Before_Discussing_a_Return_or_Exchange\"><\/span>What Should You Check Before Discussing a Return or Exchange?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>If you find something that bothers you on a piece, don&#8217;t jump to calling it faulty; sort out the description at purchase, your history of use, and any change in condition before consulting the seller, and it will be easier for the seller to assess the situation.<\/b><\/p>\n<p>There is no need to hold back for fear that &#8220;if I enquire, they&#8217;ll think it&#8217;s a complaint.&#8221;<\/p>\n<p>Checking on a condition you&#8217;re unsure about is a natural step in continuing to use maker&#8217;s pieces properly.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Review_the_Original_Product_Description\"><\/span>Review the Original Product Description<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The first things to check are the product page on the online shop, any enclosed instructions, and official guidance from the maker or manufacturer.<\/p>\n<ul>\n<li>There is crazing<\/li>\n<li>Iron flecks or black spots may appear<\/li>\n<li>There is individual variation in glaze depth<\/li>\n<li>Pinholes may be seen<\/li>\n<li>Sealing (me-dome) is recommended<\/li>\n<li>Not for microwave or dishwasher use<\/li>\n<\/ul>\n<p>Check for wording such as the above.<\/p>\n<p>Whether the product page carries a clear explanation and photographs in advance is also important evidence when judging &#8220;individual variation&#8221; in a sales sense.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Check_Whether_It_Was_Before_or_After_Use\"><\/span>Check Whether It Was Before or After Use<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sort out, too, when the condition that bothers you arose.<\/p>\n<p>Whether it was there from opening, appeared after several uses, followed a drop or impact, or came after using a heating appliance or dishwasher\u2014each changes what you should check.<\/p>\n<p>As far as you can remember is fine; convey your history of use to the seller.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Photograph_From_Four_Angles\"><\/span>Photograph From Four Angles<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When enquiring to a shop or maker, preparing the following photographs\u2014not just a close-up of the part that bothers you\u2014so that the condition is clear will help it come across.<\/p>\n<ul>\n<li>The whole piece<\/li>\n<li>A close-up of the part that bothers you<\/li>\n<li>The opposite side or the underside<\/li>\n<li>The inside and outside of the piece corresponding to the spot in question<\/li>\n<\/ul>\n<p>If the size is hard to make out, one method is to place a ruler or the like nearby when photographing.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Items_to_Convey_When_Enquiring_to_the_Shop\"><\/span>Items to Convey When Enquiring to the Shop<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>For an enquiry, it is enough to summarise the following concisely.<\/p>\n<ul>\n<li>Product name<\/li>\n<li>Date of purchase<\/li>\n<li>Number of uses<\/li>\n<li>Whether it was present when you bought the piece<\/li>\n<li>When you noticed the change<\/li>\n<li>The presence or absence of leaking, sharpness, flaking and so on<\/li>\n<li>Photographs that show the condition<\/li>\n<\/ul>\n<p>You do not need to lead with a conclusion such as &#8220;this is faulty, isn&#8217;t it.&#8221;<\/p>\n<p>Asking &#8220;there are fine lines on the glaze surface, and I can&#8217;t tell whether it is crazing or a condition I should avoid using\u2014could you check?&#8221; makes it easier for both sides to confirm the condition.<\/p>\n<p>Note that conditions for returns, exchanges and refunds differ by seller. <b>Don&#8217;t generalise into &#8220;maker&#8217;s pieces can be exchanged&#8221; or &#8220;handmade items can&#8217;t be returned&#8221;; check the sales conditions of where you bought it.<\/b><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Five_Things_to_Check_Next_Time_You_Buy_Online\"><\/span>Five Things to Check Next Time You Buy Online<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Next time you buy a maker&#8217;s piece online, checking the following helps reduce mismatches in understanding after purchase.<\/p>\n<ul>\n<li><b>Concrete examples of individual variation:<\/b> whether there are photos and explanation, not just &#8220;variation applies&#8221;<\/li>\n<li><b>Use:<\/b> whether the use\u2014tableware, flower vessel, decorative and so on\u2014is clear<\/li>\n<li><b>Conditions of use:<\/b> whether there is guidance on microwave, dishwasher, oven and the like<\/li>\n<li><b>Care method:<\/b> whether there are specific cautions such as sealing or how to dry<\/li>\n<li><b>Enquiry terms:<\/b> whether a point of contact is given for damage or faults on arrival<\/li>\n<\/ul>\n<p><b>There is no need for the buyer alone to put up with &#8220;it&#8217;s one of a kind, so of course it differs from the photo.&#8221;<\/b> Being able to understand in advance what kinds of variation to expect is also important information for buying craft with confidence.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"To_Use_a_Piece_for_a_Long_Time_How_Should_You_Handle_It_After_Purchase\"><\/span>To Use a Piece for a Long Time, How Should You Handle It After Purchase?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Pottery differs from work to work in water absorption, glaze, decoration and firing conditions. Don&#8217;t judge by generalities alone; give priority first to the method of use shown by the maker, manufacturer or seller.<\/b><\/p>\n<p>The Pottery Day official site introduces pottery (t\u014dki) as ware made by applying glaze to a water-absorbent, clay-based body, and explains that it has different properties from porcelain.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/material\" rel=\"noopener nofollow\" target=\"_blank\">\u3084\u304d\u3082\u306e\u306e\u7d20\u6750\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Follow_the_Makers_or_Manufacturers_Instructions_First\"><\/span>Follow the Maker&#8217;s or Manufacturer&#8217;s Instructions First<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Avoid blanket rules such as &#8220;pottery always needs sealing&#8221; or &#8220;you can&#8217;t use a dishwasher with maker&#8217;s pieces.&#8221;<\/p>\n<p>Even among pottery, the clay, glaze, firing, decoration and design of the work differ.<\/p>\n<p><b>Where there is guidance on use for the individual product, giving that guidance top priority<\/b> is the basic rule.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Dry_Thoroughly_After_Washing\"><\/span>Dry Thoroughly After Washing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In water-absorbent pottery, moisture can remain in the body after washing.<\/p>\n<p>The Pottery Day official site, too, notes that absorption of moisture from the base can bring on age-crazing early and become a cause of leaking, and advises drying the base well and using and storing the piece in a place free of moisture.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/usage\/others\" rel=\"noopener nofollow\" target=\"_blank\">\u305d\u306e\u4ed6\u306e\u5546\u54c1\u30fb\u9676\u5668\u306e\u6271\u3044\u65b9\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/p>\n<p>Rather than putting a piece away damp in a sealed cupboard straight after washing, dry the whole piece thoroughly, especially around the foot ring (k\u014ddai).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Dont_Rule_on_Microwave_and_Dishwasher_Use_Uniformly\"><\/span>Don&#8217;t Rule on Microwave and Dishwasher Use Uniformly<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Whether a microwave, dishwasher, oven and the like can be used cannot be determined simply by whether a piece is pottery or porcelain.<\/p>\n<p>The conditions differ with decoration, glaze, water absorption and the design of the piece.<\/p>\n<p>We recommend <b>checking the usage labelling shown by the work, manufacturer or seller, and if the wording is unclear, enquiring before use.<\/b><\/p>\n<h3><span class=\"ez-toc-section\" id=\"If_You_Notice_a_Crack_Chip_or_Leak_Dont_Keep_Using_It\"><\/span>If You Notice a Crack, Chip or Leak, Don&#8217;t Keep Using It<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If a clear crack or chip arises during use, stop using the piece for now, however attached to it you are.<\/p>\n<p>The Pottery Day official site advises against using pottery with cracks, chips or heavy scuffs, since it can break unexpectedly.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/usage\/others\" rel=\"noopener nofollow\" target=\"_blank\">\u305d\u306e\u4ed6\u306e\u5546\u54c1\u30fb\u9676\u5668\u306e\u6271\u3044\u65b9\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/p>\n<p>The same site also shows that age-crazing can become a cause of leaking. Avoid continuing to use a piece where leaking can be confirmed on the assumption that &#8220;it&#8217;s only crazing, so it&#8217;s fine.&#8221;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ%EF%BD%9CQuestions_About_Crazing_Black_Spots_and_Pinholes\"><\/span>FAQ\uff5cQuestions About Crazing, Black Spots and Pinholes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Finally, we sort out the questions that most often cause hesitation when you have bought a maker&#8217;s piece. The basic rule is not to judge by the name of a phenomenon alone, but to check the piece&#8217;s function and the explanation for each product.<\/b><\/p>\n<dl>\n<dt><b>Q. Is crazing a defect?<\/b><\/dt>\n<dd><b>A. Not necessarily.<\/b> Crazing is a crack that forms in the glaze surface; while it can be a flaw, it is also sometimes used deliberately as a pattern or expression. Check the work&#8217;s specification and the seller&#8217;s explanation.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/glossary\" rel=\"noopener nofollow\" target=\"_blank\">\u7528\u8a9e\u8f9e\u5178\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/dd>\n<dt><b>Q. How do you tell crazing from a crack in the body?<\/b><\/dt>\n<dd><b>A. You may not be able to tell from appearance alone.<\/b> If there is a clear crack running through the inside and outside of the piece, a step, a sharp catch or leaking, do not judge it as crazing yourself; stop using the piece and check with the seller.<\/dd>\n<dt><b>Q. Can water leak from crazing?<\/b><\/dt>\n<dd><b>A. Under some conditions it can lead to leaking.<\/b> The Pottery Day official site notes that age-crazing from absorption at the base can become a cause of leaking. Don&#8217;t keep using a piece that leaks; check it.<br \/>\n(Source: <a href=\"https:\/\/yakimono.or.jp\/information\/usage\/others\" rel=\"noopener nofollow\" target=\"_blank\">\u305d\u306e\u4ed6\u306e\u5546\u54c1\u30fb\u9676\u5668\u306e\u6271\u3044\u65b9\uff5c\u9676\u5668\u306e\u65e5\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>)<\/dd>\n<dt><b>Q. Are black spots on pottery mould?<\/b><\/dt>\n<dd><b>A. You can&#8217;t tell from a black spot alone.<\/b> Iron in the clay can appear as black spots through firing, but this needs to be considered separately from staining that arose after use. Nor can you conclude that &#8220;if it won&#8217;t wipe off, it must be iron.&#8221;<\/dd>\n<dt><b>Q. Can a piece with a pinhole be used as tableware?<\/b><\/dt>\n<dd><b>A. The presence of a pinhole alone doesn&#8217;t decide usability.<\/b> Give priority to the work&#8217;s stated use, and if the size, depth, flaking or sharpness bothers you, check with the maker or seller.<\/dd>\n<dt><b>Q. Is ishihaze a defect?<\/b><\/dt>\n<dd><b>A. You can&#8217;t tell whether something is acceptable or defective from the name alone.<\/b> It is sometimes treated as the expression of a work, but if there is a sharp protrusion, flaking, or a piece coming away during use, we recommend checking.<\/dd>\n<dt><b>Q. Can crazing increase after purchase?<\/b><\/dt>\n<dd><b>A. Crazing can appear over time.<\/b> Dry thoroughly after washing, and follow the handling method for each work.<\/dd>\n<dt><b>Q. When should I contact the shop?<\/b><\/dt>\n<dd><b>A. Leaking, a clear crack, a sharp chip, flaking, a change that has advanced markedly after use, and a state clearly different from the product description are useful guides.<\/b> When you cannot judge, it is fine to check with photos attached.<\/dd>\n<dt><b>Q. With a maker&#8217;s piece, is a small chip &#8220;character&#8221; too?<\/b><\/dt>\n<dd><b>A. No.<\/b> Expression at the making stage and breakage of the vessel are separate. Where there is a sharp chip, especially at the rim, stop using the piece.<\/dd>\n<dt><b>Q. Can I use a microwave or dishwasher?<\/b><\/dt>\n<dd><b>A. This can&#8217;t be judged uniformly across all pottery.<\/b> Check the individual conditions of use shown by the work, maker, manufacturer or seller.<\/dd>\n<\/dl>\n<p>Maker&#8217;s pieces have an appeal distinct from the uniformity of industrial products. But if you explain that value by saying &#8220;everything is character&#8221; or &#8220;everything is individuality,&#8221; you end up moving further from understanding pottery.<\/p>\n<p>Crazing, iron flecks, pinholes and the running of glaze each have a reason bound up with material and the making process. And at the same time, a vessel is not only for appreciation; it is an object meant to be held, used, washed and lived with day after day.<\/p>\n<p>That is why what Kogei Japonica wants to value is <b>not concluding that &#8220;it has value because it is imperfect,&#8221; but knowing why that change arose, how it functions within the work&#8217;s overall expression, and how to live with it as a vessel.<\/b><\/p>\n<p>What is needed between maker and user is not unconditional tolerance. It is sharing, concretely, the maker&#8217;s intent, the properties of the material and the cautions for use. Through that accumulation, craft becomes not &#8220;something special and hard to handle,&#8221; but something that can become part of everyday life for years to come.<\/p>\n<div class=\"linkcard\"><div class=\"lkc-internal-wrap\"><a class=\"lkc-link no_icon\" href=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/handmade-japanese-tableware\/\"><div class=\"lkc-card\"><div class=\"lkc-info\"><img decoding=\"async\" class=\"lkc-favicon\" src=\"https:\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2025\/06\/cropped-logo_ver1-32x32.webp\" alt=\"\" width=\"16\" height=\"16\" \/><div class=\"lkc-domain\">en.kogei-japonica.com\/media<\/div><\/div><div class=\"lkc-content\"><figure class=\"lkc-thumbnail\"><img decoding=\"async\" class=\"lkc-thumbnail-img\" src=\"\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/2026\/03\/japanese-tableware-1.webp\" width=\"100px\" height=\"108px\" alt=\"\" \/><\/figure><div class=\"lkc-title\">An Expert Guide to Artisan-Made Japanese Tableware: Elevating Your Daily Dining<\/div><div class=\"lkc-url\" title=\"https:\/\/en.kogei-japonica.com\/media\/crafts\/handmade-japanese-tableware\/\">https:\/\/en.kogei-japonica.com\/media\/crafts\/handmade-japanese-tableware\/<\/div><div class=\"lkc-excerpt\">Artisan-made Japanese tableware has the ability to bring a sense of richness to daily life simply by serving as a vessel for your everyday meals.However, for international designers and new readers drawn to Japanese aesthetics and the value of handcraft, selecting that first piece can feel somewhat intimidating.In this article, drawing on Kogei Japonica&#039;s specialized knowledge and factual research, we explain the key points for choosing vessels that fit naturally into your lifestyle.Rath...<\/div><\/div><div class=\"clear\">\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div><\/a><\/div><\/div>\n<p>And if you are a maker, workshop or business selling craft and are unsure &#8220;how far to explain individual variation&#8221; or &#8220;how to convey a work&#8217;s expression alongside its cautions for use,&#8221; do make use of Kogei Japonica&#8217;s support for opening sales channels and communicating your work. We support product descriptions and content design that convey a work&#8217;s value without diminishing it, and without misunderstanding on the buyer&#8217;s part.<\/p>\n<div class=\"linkcard\"><div class=\"lkc-external-wrap\"><a class=\"lkc-link no_icon\" href=\"https:\/\/en.kogei-japonica.com\/personal\/promotion\/\" target=\"_blank\" rel=\"external noopener\"><div class=\"lkc-card\"><div class=\"lkc-info\"><img decoding=\"async\" class=\"lkc-favicon\" src=\"https:\/\/www.google.com\/s2\/favicons?domain=en.kogei-japonica.com\" alt=\"\" width=\"16\" height=\"16\" \/><div class=\"lkc-domain\">en.kogei-japonica.com<\/div><\/div><div class=\"lkc-content\"><figure class=\"lkc-thumbnail\"><img decoding=\"async\" class=\"lkc-thumbnail-img\" src=\"\/\/en.kogei-japonica.com\/media\/wp-content\/uploads\/pz-linkcard\/cache\/7f33d99840e9f29881b513aaae746b17c87a2330f228358275f9ca515173ee0d.jpeg\" width=\"100px\" height=\"108px\" alt=\"\" \/><\/figure><div class=\"lkc-title\">Sales &amp; Promotion for Craft Artists and Artisans<\/div><div class=\"lkc-url\" title=\"https:\/\/en.kogei-japonica.com\/personal\/promotion\/\">https:\/\/en.kogei-japonica.com\/personal\/promotion\/<\/div><div class=\"lkc-excerpt\">Kogei Japonica supports craft artists, artisans, and independent studios working in Japanese craft traditions through online sales, product page creation, editorial features, and social media promotion. No upfront or monthly listing fees; a 30% commission applies only to completed sales.<\/div><\/div><div class=\"clear\">\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div><\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Have you ever bought a piece by an independent maker, found fine crack-like lines, black dots or tiny holes on the surface, and worried that it might be faulty? To put it plainly: crazing (kanny\u016b), iron spots (tetsupun or iron flecks), pinholes and the like cannot be judged as &#8220;faulty&#8221; or &#8220;returnable&#8221; simply because they<\/p>\n","protected":false},"author":2,"featured_media":7594,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[84],"tags":[],"class_list":["post-7593","post","type-post","status-publish","format-standard","has-post-thumbnail","category-crafts"],"acf":[],"aioseo_notices":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/posts\/7593","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/comments?post=7593"}],"version-history":[{"count":4,"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/posts\/7593\/revisions"}],"predecessor-version":[{"id":7606,"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/posts\/7593\/revisions\/7606"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/media\/7594"}],"wp:attachment":[{"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/media?parent=7593"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/categories?post=7593"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/en.kogei-japonica.com\/media\/wp-json\/wp\/v2\/tags?post=7593"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}