Ohio Rev. Code Ann. § 3335.21

The department of ceramics of the Ohio state university shall offer special instruction to clay workers on the origin, composition, properties and testing of clays, the selection of materials for different purposes, the mechanical and chemical preparation of clays, the laws of burning clays, the theory and practice of the formation of clay bodies, slips, and glazes, and the laws which control the formation and fusion of silicates.