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Ingredients

Ingredient Amount
Magnesium Carbonate* 50.00
Nepheline Syenite 50.00

Instructions


Specific gravity: 1.36. Magnesium carbonate has a high shrinkage rate, causing it to crack on bisqueware as it dries. During the firing, because of its high surface tension, it continues to constrict itself, making crawled and beaded surfaces depending on how hot it is fired. It needs to be applied thick enough so that it cracks as it dries, but not so thick that it falls off the bisqueware.

*I substituted magnesium carbonate with light magnesium carbonate in the tests of this recipe.

Original recipe shared by Lana Wilson in the February 1990 issue of Ceramics Monthly.

This recipe was shared by Alisa Clausen in the February 2020 issue of Ceramics Monthly.

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