Copper(II) oxide

[3] It is produced on a large scale by pyrometallurgy, as one stage in extracting copper from its ores.

Copper(II) oxide belongs to the monoclinic crystal system.

[3] Cupric oxide is used as a pigment in ceramics to produce blue, red, and green, and sometimes gray, pink, or black glazes.

[8] A copper oxide electrode formed part of the early battery type known as the Edison–Lalande cell.

Copper oxide was also used in a lithium battery type (IEC 60086 code "G").

NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 0: Will not burn. E.g. water Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium Special hazards (white): no code