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patina
(redirected from Patination)

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.03 sec.
patina (păt`ənə), coating of carbonate of copper on articles of copper or bronze, formed after long exposure to a moist atmosphere or burial in the earth. Although commonly green, patina varies in color and consistency; it may be red, brown, black, blue, or gray, or it may be smooth, glossy, or crusty. It may be imitated by a number of oxidation processes. The term has been extended to include the film formed on metals, pottery, marble, and other materials by exposure and to the mellow surface acquired by furniture with time and waxing.

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By contrast, the patination of brass is gentler and its effects can be more closely controlled.
Sculpture instructor and nationally recognized authority on the patination of metals, Ron Young, an art instructor at California State Univ, presented slides representing the many color effects that can be induced in cast metal (particularly bronze) to add aesthetic impact.
One offshoot of Franey's research hasbeen the development of a natural patination process that quickly gives shiny copper sheets a weathered, green look.
 
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