FULLN CHEMICAL enamel pigments Cobalt black FU-E653 is a black inorganic pigment obtained from raw materials such as cobalt oxide, copper oxide, iron red and chrome green through mixing, calcination and micropowder processing. During the calcination process at high temperature, Co2+, Co3+, Cu2+, Fe2+, Fe3+ and Cr3+ are uniformly diffused to form spinel crystal structure.This series of black is suitable for enamel.