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.
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2. The green rust formed on copper. [Colloq.]
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Note: This rust is a carbonate of copper, and should not be
confounded with true verdigris. --U. S. Disp.
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{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.
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