https://www.sghbgyl.com/products/cobalt-oxide-cas-no-1307-96-6.html Cobalt Oxide (coo cobalt oxide), with the chemical formula CoO, is a metal oxide. It is a black-gray hexagonal crystal powder. It is insoluble in water, alcohol. It is easily reduced to metallic cobalt. It easily reacts with silicon dioxide and silica at high temperatures. Aluminum or zinc oxide reacts to produce a variety of pigments.All Rights Reserved