verdigris

1) A bluish-green pigment (copper acetate) obtained by applying acetic acid to copper plates. Pronunciation here. Web resources here and here.

2) The natural patina formed when copper, brass or bronze is exposed to air and/or water over time.

Verdigris pigment

Frédéric Bartholdi. Liberty Enlightening the World. Copper with iron armature. Liberty Island, New York. 1886.

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