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Patina
Change of object's surface through age and exposure / From Wikipedia, the free encyclopedia
For the village in Estonia, see Pattina. For the United States Navy ship, see USS Pattina (SP-675). For the Los Angeles restaurant, see Patina (restaurant).
Patina (/pəˈtiːnə/ pə-TEE-nə or /ˈpætɪnə/ PAT-ih-nə) is a thin layer that variously forms on the surface of copper, brass, bronze, and similar metals and metal alloys (tarnish produced by oxidation or other chemical processes), or certain stones[1] and wooden furniture (sheen produced by age, wear, and polishing), or any similar acquired change of a surface through age and exposure.
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Ancienne_unit%C3%A9_de_monnaie_en_cuivre.jpg/640px-Ancienne_unit%C3%A9_de_monnaie_en_cuivre.jpg)
Additionally, the term is used to describe the aging of high-quality leather. The patinas on leather goods are unique to the type of leather, frequency of use, and exposure.
Patinas can provide a protective covering to materials that would otherwise be damaged by corrosion or weathering. They may also be aesthetically appealing.