Cobalt Oxide , 1. used in ceramics, pottery and enamels as blue pigment 2. also used as oxidizer, oil paint, etc.... cobalt ... vitriol, not solve in water. Mainly used in ceramics, pottery and enamels as blue pigment, also could ... 0.1%maxPacking50kg/iron drum Application: glass, ceramic, porcelain enamel, magnetic material, cobalt activator, nutrient for domestic animals. Cobalt Oxide Co2O3,Co3O4