It may be low-, mid-, or high-fire clay, measured using the cone system.
Dry your piece to leather hard, then bisque fire. Bisque firing is required to increase your pottery’s durability, making it more stable for the next steps of glazing and glaze firing. The temperature and amount of time you bisque fire your clay will depend upon the firing range and cone. It may be low-, mid-, or high-fire clay, measured using the cone system.