Wood Fire Stoneware Cone 10 Clay. A porcelain/stoneware blend that reacts beautifully when wood fired producing a reddish brown color. In a soda firing the color ranges from maroon to gold. Fires Between Cone 8 - Cone 10+. Shrinkage rate is Cone 10 - 14.5%. Best use is Oxidation firing, distorting thrown forms.