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verdigris





verdigris
A blue-green powder, which consists of basic copper (II) acetate. It is made by pickling copper in acetic acid and is used as a pigment and a mordant in dyeing. The term is also applied to the blue-green coating, or patina, that exposed copper acquires in air over a period of time. It is usually a basic copper carbonate, but near the sea will be a basic copper chloride.


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   • INDUSTRIAL CHEMISTRY