Use
Cobalt oxide is a kind of unstable and impossible to be in the free state, usually refers to the cobalt oxide are attached with a certain amount of cobalt tetraoxide when heated cobalt oxide is reduced to cobalt tetraoxide. Cobalt(II) oxide is used as a pigment for ceramics and paints; for drying paints, varnishes and oils; for coloring glass; as a catalyst; and for preparation of other cobalt salts. The commercial product is a mixture of cobalt oxides.?