Patina

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A bronze coin of the Han Dynasty - circa 1st century BC with green patina

Patina ( or ) is a tarnish that forms on the surface of copper, bronze and similar metals (produced by oxidation or other chemical processes); stone; a sheen on wooden furniture produced by age, wear, and polishing; or any such acquired change of a surface through age and exposure. Patinas can provide a protective layer to materials that would otherwise be damaged by corrosion or weathering. They may also be aesthetically appealing.

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