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Copper is a ductile and malleable base metal that is valued for its high thermal and electrical conductivity. Easily identifiable because of its iridescent, golden red color, copper and its alloys, have been used by humans for thousands of years.
Main article: Brass. A brass is an alloy of copper with zinc. Brasses are usually yellow in color. The zinc content can vary between few % to about 40%; as long as it is kept under 15%, it does not markedly decrease corrosion resistance of copper. bronze is an alloy of copper and other metals, most often tin, but also aluminium and silicon. 1  Aluminium bronzes are alloys of copper and aluminium. 2  Bell metal. 3  Phosphor bronze. 4  Nickel bronzes, e.g. nickel silver and cupronickel. 5  Speculum metal. 6  UNS C69100.