Cupric oxide is a chemical compound made of copper and oxygen, with the formula CuO. It appears as a black solid and is commonly used in various applications, including as a pigment in ceramics and glass, and as a catalyst in chemical reactions. In addition to its industrial uses, cupric oxide is also important in the field of electronics, where it can be used in the production of semiconductors. It can be produced through the oxidation of copper metal or by heating copper(II) salts.