The word for today is…
verdigris (noun):
1a : 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
Source : Merriam -Webster
Etymology :“Green of Greece”—that is the literal translation of vert de Grece, the Anglo-French phrase from which we get the modern word verdigris. A coating of verdigris forms naturally on copper and copper alloys such as brass and bronze when those metals are exposed to air. (It can also be produced artificially.) Like cinnabar, fuchsia, and amaranth before it, however, verdigris is also seeing increased use as a color name that can be applied to anything suggestive of its particular hue
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