Lowfire clays, also called earthenware clays, are rarely taken to higher temperatures than cone 04 (about 1940 Fahrenheit). These sample pictures show the clay colors after oxidation firing in an electric kiln. They’re easy to work with, easy to fire, and offer the widest range of glaze color possibilities for decoration. Lowfire clays must be glazed with foodsafe glazes, and the glazes fired to their proper maturity, to make foodsafe ware.