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Crawling glazes withdraw into islands during melting leaving bare body patches

This problem is almost always caused by glazes shrinking too much during drying, and then cracking. Those cracks become the crawl points during firing. Excessive shrinkage is normally a product of too much raw clay in a glaze. Even glazes having marginally high clay can crack if applied too thick. It is likewise with multi-layer application without consideration for the specific needs of that process (e.g. failure to use a base coat glaze for the first layer). Multi-layering of glazes rewets the first layer, stressing its bond with the body and pulling it away from the body as it shrinks, base coat glazes have better adherence. Crawling is quite prevalent in once-fired ware since glaze bonding is more tenuous.

To state again: Glazes contain clay to suspend their slurries. Clay shrinks when it dries. Some shrinkage can be tolerated but when it is excessive something has to give. As glaze layer thickness increases it is afforded more and more power to impose its shrinkage on the bond with the body. At some point, that bond will be compromised in places where cracks occur to release the tension. Even if these do not appear on dry ware, bond compromise can still exist.

Crawling glazes withdraw into islands during melting leaving bare body patches

Related Pictures

Glaze crawling on single-fire - solved by bisque firing


Glaze crawling on the rim

This problem only happened once in a while at a production pottery. On the rims of thick or thin pieces. The ware is glazed inside and out, the rim sponge-cleaned after each. Finally, the rim was dipped (after a period of drying). Glaze thickness and layering did not affect the appearance of the issue. They control glaze rheology carefully (according to specs). It appeared the problem had been solved when it was discovered that a worker was using hand cream and getting it on the rim while handling the ware (the touch points being the crawl points). Further, ware was not being kept clean and dust-free. But these were not the issue. In the end this was solved by bisque firing. Yes, they were glazing ware in the dry, or green state. The fact that they could accomplish this on thin-walled ware is amazing. Their experience is a testament to the value of bisque firing for smaller production facilities having limited equipment and resources.

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Troubles Crawling
Ask yourself the right questions to figure out the real cause of a glaze crawling issue. Deal with the problem, not the symptoms.

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