A collection of potters" favorite glazes made easy! These lead-free, low-fire glazes are fired in an oxidation kiln. They are made for anyone who would like to achieve the Cone 10 reduction effects without having to have a reduction gas kiln or firing at that high temperaure. Compatible with any stoneware or porcelain clays. Dinnerware safe. This CL product is restricted from use K-6 (ASTM D-4236/LHAMA)