VERDIGRIS

verdigris. Verdigris, n. the acetite of copper, the acetous acid combined with copper

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Ver″di‐gris (?), n. [[F. vert-de-gris, apparently from verd, vert, green + de of + gris gray, but really a corruption of LL. viride aeris (equivalent to L. aerugo), from L. viridis green + aes, aeris, brass. See Verdant, and 2d Ore.]] 1. 1. (Chem.) A green poisonous substance used as a pigment and drug, obtained by the action of acetic acid on copper, and consisting essentially of a complex mixture of several basic copper acetates.
2. 2. The green rust formed on copper.
☞ This rust is a carbonate of copper, and should not be confounded with true verdigris. U. S. Disp. Blue verdigris (Chem.), a verdigris having a blue color, used as a pigment, etc. — Distilled verdigris (Old Chem.), an acid copper acetate; — so called because the acetic acid used in making it was obtained from distilled vinegar. — Verdigris green, clear bluish green, the color of verdigris.