1. (Chem.) Defn: 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. [Colloq.]
Note: 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 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.
The pedestal, it appeared to me, was of bronze, and was thick with verdigris. It chanced that the face was towards me; the sightless eyes seemed to watch me; there was the faint shadow of a smile on the lips.
H. G. Wells. The Time Machine
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He at once took a pin from his lapel and was going to prick his flesh, but Tom said:
“Hold on! Don’t do that. A pin’s brass. It might have verdigrease on it.”
“What’s verdigrease?”
“It’s p’ison. That’s what it is. You just swaller some of it once—you’ll see.”
I distinguished a trace of verdigris, a tiny bit of crushed shell and a fleshiness difficult to define because it was slighter than a mistletoe-berry and less transparent than a glass bead.