Dictionary: patina1
See paten (sense 1).
[Medieval Latin, from Latin, plate. See paten.]
pat·i·na2 ( also pa·tine )
A thin greenish layer, usually basic copper sulfate, that forms on copper or copper alloys, such as bronze, as a result of corrosion.
The sheen on any surface, produced by age and use.
A change in appearance produced by long-standing behavior, practice, or use: a face etched with a patina of fine lines and tiny wrinkles.
[Italian, from Latin, plate (from the incrustation on ancient metal plates and dishes). See paten.]
Archaeology Dictionary: patina
(patination) [De]
Changes to the outer surface of an artefact that make its colour, texture, feel, or composition different from the main body of the piece, usually as a result of chemical, physical, or biological alteration through contact with the surrounding environment. On flint, patination often appears as a bluish milky-white layer on the surface. This is caused by alkaline conditions slowly affecting the surface of the flint when exposed to the atmosphere or rainwater. The term is also used to refer to the green crust that forms as a result of corrosion on the surface of bronze objects. Under normal circumstances patina takes time to form and is therefore often taken as a reliable indicator of antiquity.
Columbia Encyclopedia: 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.
Patina is a chemical compound formed on the surface of metal. Patinas form on metal from exposure to the elements. They are often deliberately added by artists and metalworkers. Patinas may be used to 'antique' objects, as a part of the design or decoration of art and furniture.
Patinas are restricted to exposed surfaces and can flake off. One reason bronze is so highly valued in statuary is that its patina protects it against further corrosion. This natural patina seldom shows a tendency to flake. Brass is also resistant to corrosion, but it is, in the long run, not as attractive since local pitting shows against the shiny background.
Figuratively, patina can refer to any fading, darkening or other signs of age, which are felt to be natural and/or unavoidable.
http://www.answers.com/Patina?cat=technology
1. a film or incrustation, usually green, produced by oxidation on the surface of old bronze and often esteemed as being of ornamental value.
2. a similar film or coloring appearing gradually on some other substance.
3. a surface calcification of implements, usu. indicating great age. Also,patine.
http://dictionary.infoplease.com/patina
http://www.artlex.com/ArtLex/Pas.html
Originally the green brown encrustation on bronze, this now includes the natural effects of age or exposure on a surface.
http://www.rexart.com/glossary.html#p
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.
http://encyclopedia2.thefreedictionary.com/patina
A covering that forms naturally on hard surfaces over a long interval. One example is the green layer that forms on copper metal or copper alloys as a result of corrosion. Another is a varnish-like coating found on limestone ossuaries (bone boxes) such as James alleged ossuary and the ossuaries allegedly belonging to Jesus' immediate family.
http://www.religioustolerance.org/gl_p.htm
http://www.archaeologywordsmith.com/cgi-bin/lookup.php?category=&where=headword&terms=patina
The changed color or texture of a surface due to weathering or aging.
http://glossary.gardenweb.com/glossary/patina.html
http://antoine.frostburg.edu/chem/senese/101/glossary/p.shtml#patina
Synonym for toning.
http://www.pcgs.com/lingo.chtml?universeid=313&letter=0#lingo1519
the weathering or aging of the exposed surface of a material, which can involve colour change, e.g. copper turns green, while lead goes from silver to grey.
http://www.trp.dundee.ac.uk/research/glossary/patina.html