verdigris
/ˈvəːdɪɡriː/ /ˈvəːdɪɡriːs/
noun
mass noun
A bright bluish-green encrustation or patina formed on copper or brass by atmospheric oxidation, consisting of basic copper carbonate.
Origin
Middle English from Old French verte-gres, earlier vert de Grece ‘green of Greece’.
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Bob's statue proudly wore the oxidation of virdigris proudly like a cape.