Copper(II) oxide, also known as cupric oxide, is a chemical compound with the formula CuO. It consists of copper in a +2 oxidation state and oxygen. This black solid is commonly used in various applications, including as a pigment in ceramics and glass, as well as in the production of other copper compounds. In addition to its industrial uses, copper(II) oxide has applications in agriculture as a fungicide and in the manufacturing of batteries. It can also be found in some electronic devices. Safety precautions are necessary when handling this compound, as it can be harmful if ingested or inhaled.