1) For making electrical wires, cables and conducting apparatus. 2) As a coinage metal and in ornaments, jewelry for making them hard. 3) For making water stills, kettles, vacuum pans, steam pipes and fire boxes of locomotive engines. 4) In electroplating and electrotyping. 5) Copper salts are largely used as insecticides and coloring materials. 6) For making scientific apparatus such as hypsometers, colorimeters, etc. 7) For making alloys like brass, bronze, gun metal, etc.