Cobalt blue [Co(AlO2)2], also known as cobalt ultramarine or azure blue, is a compound of
aluminum oxide and cobalt. It is used as a pigment that mixes well with both oil and water.
It also has cosmetic uses for eye shadow and in grease paint. Cobalt blue is one of the most
durable blue pigments in that it resists weathering in paints and holds up to other wear and
tear.
COBALT BLUE is an inorganic pigment that is the reaction product of high temperature calcination in which cobalt (II) oxide and aluminum oxide in varying amounts are homogeneously and ionically interdiffused to form a crystalline matrix of spinel. Its composition may include any one or a combination of the modifiers MgO, ZnO, Li2O, or TiO2.
