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verdigris
Verdigris is the common name for a green pigment obtained through the application of acetic acid to copper plates〔"Verdigris" Oxford English Dictionary〕 or the natural patina formed when copper, brass or bronze is weathered and exposed to air or seawater over a period of time. It is usually a basic copper carbonate, but near the sea will be a basic copper chloride.〔Sharp, D. W. A: "Penguin Dictionary of Chemistry", page 419. Penguin Books, 1990 (2nd edition)〕 If acetic acid is present at the time of weathering, it may consist of copper(II) acetate.
==Etymology==
The name ''verdigris'' comes from the Middle English ''vertegrez'', from the Old French ''verte grez'', an alteration of ''vert-de-Grèce'' ("green of Greece"). The modern French spelling of this word is ''vert-de-gris'' ("green of grey"). Since it was used as a pigment in paintings and other art objects (as green color), it was required by artists in Greece.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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