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From The Collaborative International Dictionary of English v.0.48:
Verdigris \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. (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. [1913 Webster] 2. The green rust formed on copper. [Colloq.] [1913 Webster] Note: This rust is a carbonate of copper, and should not be confounded with true verdigris. --U. S. Disp. [1913 Webster] 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. [1913 Webster]