Patina
Patina is a green surface texture created by slow oxidation of copper. It can form on pure copper objects as well as alloys which contain copper, such as bronze.
While excessive patina is often washed away from public statues along with bird droppings, few bronze statues of any age lack patina entirely.
Figuratively, "patina" can refer to any fading, darkening or other signs of age, which are felt to be natural and/or unavoidable.
Sculptors often apply a patina to a sculpture on purpose. This can emphasize the artistic look of a work.
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