MB Stoneware Cone 10 Clay. Extremely smooth, white, plastic mid-range clay body. It is vitreous and porcelain-like when fired at cone 8. MB stoneware is designed primarily for oxidation firing, producing a white color in oxidation and gray in reduction. Fires Between Cone 8-10, 2280-2350° F. Shrinkage rate is Cone 8 - 10.5%, Cone 10 - 11%. Best use is Oxidation firing, distorting thrown forms. Color is White - Oxidation, Gray- Reduction.