Cobalt Oxide , 1. used in ceramics, pottery and enamels as blue pigment ... : 72%Place of Origin:ChinaCAS No. 1307-96-6Features: Cobalt oxide is black and grey powder, no smell and no sapor ... .5%maxFe:0.1%maxheavy metal(Cu)0.1%maxPacking50kg/iron drum Application: glass, ceramic, porcelain enamel, magnetic material, cobalt activator ...