verdigris
noun
ver·di·gris
ˈvər-də-ˌgrēs
-ˌgris
-grəs,
also -ˌgrē
1
a
: a green or greenish-blue poisonous pigment resulting from the action of acetic acid on copper and consisting of one or more basic copper acetates
b
: normal copper acetate Cu(C2H3O2)2·H2O
2
: a green or bluish deposit especially of copper carbonates formed on copper, brass, or bronze surfaces
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Merriam-Webster unabridged
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