Pure copper is a rose-red metal that turns purple when a layer of copper oxide forms on its surface; therefore, industrial-grade pure copper is often referred to as red copper or electrolytic copper. It has a density of 8–9 g/cm³ and a melting point of 1083 °C.

Copper, with the chemical symbol Cu, has an atomic mass of 63.54, a density of 8.92, and a melting point of 1083°C. Pure copper is pale rose or light red in color; once a layer of copper oxide forms on its surface, it takes on a copper-red appearance.