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Sulphate of Copper

The blue vitriol of commerce is obtained from the native sulphuret of copper (copper pyrites). Pure sulphate of copper is made by the direct, solution of the metal, or preferably, of its oxide or carbonate, in sulphuric acid. It consists of fine blue crystals, slightly efflorescent in the air. By heat it loses its water of crystallization and crumbles into a white powder. (See No. 120.)