pa·ti·na
/pəˈtēnə/
noun
a green or brown film on the surface of bronze or similar metals, produced by oxidation over a long period.
"many bronzes have been overcleaned, their original patina removed and artificially replaced"
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7 days ago · noun · 1. a. : a usually green film formed naturally on copper and bronze by long exposure or artificially (as by acids) and often valued ...
Patina
Patina is a thin layer that variously forms on the surface of copper, brass, bronze, and similar metals and metal alloys, or certain stones and wooden furniture, or any similar acquired change of a surface through age and exposure.
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