Light magnesium carbonate has been added to a low temperature terra cotta white glaze (about 10%). It induces crawling. It also mattes the glaze because it sources MgO. “Snakeskin” recipes to produce this effect can call for much higher percentages, but of course, fired properties (like color, gloss, thermal expansion) will be much more affected.
|Materials||Light Magnesium Carbonate|
A ceramic glaze fault that occurs during firing of the ware, islands of glaze form as it crawls, leaving bare patches of body.