Porcelain enamel coatings we offer engineered porcelain enamel frits in powder, paste, ready-to-mill and ready-to-use (rtu) forms. our products are specifically formulated to provide a wide range of chemical, physical and aesthetic properties to meet our customers' needs. In general terms, vitreous enamel, porcelain enamel, copper enamel and jewelry enamel all refer to the same thing. enamel is a glassy compound applied to and bonded by heat (fusion) to a metal surface; to a copper surface at 1450 degrees f., and to a u2026 Ceramic enamel frit. available in a variety of colors to harmonize or contrast with the vision area, the ceramic enamel frit is applied to the surface of the glass. ceramic enamel frits contain finely ground glass mixed with inorganic pigments to produce a desired color. Porcelain enamel frit, vitreous enamel, porcelain enamel, blue porcelain, white porcelain, paste porcelain, meissen porcelain, glaze, clay, glass, soapstone, lime, chemical properties 1) enamel powder often is applied as a paste, and may be transparent or opaque when fired; vitreous enamel can be applied to most metals.