Porcelain clay is found in decomposed rock deposits with little exposure to contamination. When fired, it takes on a translucent appearance. This property is unique to porcelain and is not found in other ceramic clays.
Porcelain, the highest quality of ceramic ware, can be made from any of several different types of clay, including kaolin and ball clay. The high silica content of porcelain clay causes it to fuse and vitrify at high temperatures, in a chemical reaction similar to what happens in the making of glass.
As a result, porcelain is glossy and nonporous and does not require any additional glaze to become waterproof. Porcelain provides a beautiful, delicate surface for detailed ornamentation of all kinds, conducive to the extensive use of color that I utilize in much of my pottery.