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Mitigating factors are poor adherence of the glaze to the smooth-surfaced L4170B terra cotta bisque, high zircon content in the glaze (it reduces melt fluidity) and the very thick application (this is a variation on G1916Q as a majolica glaze). Which is the most important of those factors? The adherence to the bisque. An addition of Veegum CER solved the problem (50g of the solution to 0.75 litres of glaze slurry, with added water to thin it out). Unlike with CMC gum, this slurry still goes on thick and evenly. Although the piece on the left is darker red, that is a photo issue, these were both the same body and fired at cone 04.
| 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. |
| Glossary |
Majolica
Majolica is a tradition of Italian Renaissance white opaque glazed red earthenware having brightly colored brushwork decoration. Knowing some technical details will help you better succeed with the process. |
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