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can refer to any fading, darkening, or other signs of age, which are felt to be natural or unavoidable (or both).

The chemical process by which a patina forms or is deliberately induced is called patination, and a work of art coated by a patina is said to be patinated.

Acquired patina

The green patina that forms naturally on copper and bronze, sometimes called verdigris, usually consists of varying mixtures of copper chlorides,

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