Verdigris
Verdigris , noun
[French vert-de-gris, apparently from verd, vert, green + de of + gris gray, but really a corruption of Late Latin viride aeris (equivalent to Latin aerugo), from Latin viridis green + aes, aeris, brass. See Verdant, and 2d Ore.]
1.
(Chemistry) 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.
The green rust formed on copper. [Colloquial]
This rust is a carbonate of copper, and should not be confounded with true verdigris.
Collocations (3)
Blue verdigris (Chemistry) , a verdigris having a blue color, used as a pigment, etc.
Distilled verdigris (Old Chemistry) , 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.
Verdigris , transitive verb
To cover, or coat, with verdigris. [Rare]
An old verdigrised brass bugle.