Copper chrome black is a kind of mixed metal oxide pigments, which belongs to the inorganic pigments, high temperature resistant, acid and alkali, insoluble in water, non-toxic. Specific can see Wikipedia, a very detailed introduction. Can be used in the glass (body surface can \ see you.) is used in the vitreous or surface invitreous. Is the direct melt inside. The surface made of glass paper, glass coating, baking additive color. Now the domestic real production of the relatively small, but many abroad. Calpac copper chromite black pigment is good,also can provide free samples.