Glaze is a glassy material that seals the surface of the sintered body. The glaze layer keeps the body from absorbing moisture and imparts to the body the smoothness and gloss finish. The glaze can be either transparent or opaque and is made up though careful chemical formulation. The glaze raw material is ground up in water and can be applied onto the ware by automatic spraying machine or by hand. The glaze application is a critical step in the process as the fired appearance of the glaze more or less decides the finished look on the product. In addition to all the required physical and chemical properties of the glaze, the material, being in contact with the food, also needs to be non-harzadous to our health.
The lithographic decals made to the required artwork provided locally or by the foreign buyers. The decal production starts with the separation of individual colors from the original artwork, from which positive films are generated. The films are exposed onto the silk screen. Using appropriated ceramic colors, the designs are printed onto backing sheet which is coated with water-soluble gum. The printed pattern is slid off the paper by soaking the decal in water and applied onto the ware. After decoration-firing, the ceramic colors remain and fuse onto the ware.
By mixing and grinding various types of raw materials such as clay, silica, and flux, a clay body is formed. The plastic clay body gives the shape and strength to the ceramic ware. Well-known example of a clay body is fine bone china body which contains 50% bone ash.