Tin Oxide is a white powder made by oxidizing high grade tin metal. In ceramics, tin oxide is typically used as an opacifier in glaze recipes to create strong white colors. It can also be used as a variegator in combination with other materials. When added to a glaze, tin oxide will cause the materials to clump together so make sure to sieve the glaze slurry.
Information gathered from Digitalfire Ceramic Materials Database.
