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Incrustation, usually green, on the surface of a metal (typically bronze) object, caused by corrosion. Such discoloration occurs naturally with age through exposure to the atmosphere and can be accelerated or modified when an object is buried in the sea or soil, where various substances present will cause chemical reactions. Patination can produce an attractive mellowing effect, and since the Renaissance bronze statues have often been artificially patinated, usually by treatment with acid. By extension, the term ‘patina’ can be applied to any form of surface discoloration or mellowing, for example dirty varnish on a painting.

Subjects: Art.

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