Patina

Patina is a thin layer that variously forms on the surface of copper, brass, bronze, and similar metals and alloys, or certain stones and wooden furniture, or any similar acquired change of a surface through age and exposure.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.5

NUMISNOOK

Coin collecting & numismatic history — grading, rarity, and the stories behind the metal.

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