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Glaze is crawling on overlap when it did not do so before. Why?

By far the number one cause of crawling is cracking of the glaze layer during drying. Of course, glazes having too high a percentage of plastic ball clay or bentonite will shrink and therefore crack more. But in this case, the G2934 matte recipe contains less than 20% kaolin and it worked well in the past (left plate). But this time the crawling happened on the overlap (upper right). The problem is with the specific gravity, it is too high (resulting in faster thickening for the same dip duration). This dipping glaze works best with a specific gravity of 1.44. If the slurry is too runny Epsom salts (or other flocculant) can be added to make it thixotropic. When the rheology is right it works extremely well.

Two slip decorated stoneware plates by Kat Valenzuela

Related Pictures

ChatGPT is surprisingly wrong about the causes of glaze crawling.


A glaze crawling inside a mug

ChatGPT trained on the entire internet and yet gave 100% wrong answers and neglected the key thing that causes 90% of crawling! How can the internet be so wrong? Consider the suggestions it gave: -Dust or oil on the bisque: This almost never happens. Besides, glaze is a mix of dust and water! -Too much feldspar in a glaze can cause it to shrink excessively during firing: No, high feldspar causes thermal expansion/contraction of the fired glass, not physical shrinkage of the melt. -If the clay body surface is not roughened, the glaze may not adhere properly: No, glazes don’t crawl any more on porcelains than other bodies. -If the glaze is too thick in some areas and too thin in others, it can crawl in the thin areas: No, it crawls where thick because that’s where it cracks during drying. -Over-firing or under-firing: No. Glazes fired to the ideal temperature crawl just as much. -If the pottery is dried evenly or the drying process is too rapid: No, rapid drying of glaze on bisque is important to prevent cracking. This crawling happened because the glaze cracked along the inside of that corner during drying. Such cracking is by far the number one cause of crawling, the melt pulls back from either side of the crack. The specific gravity of the slurry was too high, the resulting greater thickness right at the corner gave the shrinking glaze power to pull a crack. Adding water to bring the SG back down to 1.4 and then Epsom salts to gel it to thixotropic gave the slurry much better dipping and drying properties and totally solved this issue.

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