patina

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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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

Patina

A greenish-brown crust produced by oxidation that forms on the surface of copper and bronze, often multicolored and considered decorative; any thin oxide film which forms on a metal or other material.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Patina

 

a film ranging from green to cinnamon in color that forms on the surface of copper, bronze, and brass articles. A patina results from the natural corrosion of the metal or from patination—that is, heating or processing with oxidizing agents. A patina formed by the latter method is used to protect works of art and for decorative purposes. Roman artists were the first to recognize patina as a sign of beauty through aging. The term “patination” is also used to designate the process whereby articles not made from copper alloys, for example, plaster-of-paris sculptures, are tinted bronze.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

patina

[′pat·ən·ə or pə′tē·nə]
(geology)
A thin, colored film produced on a rock surface by weathering.
(metallurgy)
The greenish product, usually basic copper sulfate, formed on copper and copper-rich alloys as a result of prolonged atmospheric corrosion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

patina, patination

1. A greenish brown crust which forms on bronze.
2. Any thin oxide film which forms on a metal; often multicolored.
3. A film, similar in color, which forms on a material other than metal.
4. Such effects artificially induced, or imitated.
5. A green coating on the surface of copper or copper alloys that have been exposed to the atmosphere for a long time.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

patina

1
a film of oxide formed on the surface of a metal, esp the green oxidation of bronze or copper

patina

2
a broad shallow dish used in ancient Rome
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
On 20 June, Pach transmitted Chanler's message to Brancusi: 'you should take your time [on the bronze] to be sure you are satisfied with the cast, the patina and everything'.
References to a foundry-applied patina are not found after 1909, (24) whereas references to chasing (the first stage of filing, filling and correcting surface defects) occur only after 1919.
Metal chasing is technically defined as all of the metal work required to prepare the art piece for patina. Once the pieces are cleaned, they are ready to be welded together.
Once the chasing is completed, the piece can be sandblasted to even it up, or it can go straight to the patina department.
You'll need to allow at least 24 hours for the first coat to dry before applying a second coat and a patina solution (if you're using one).
Use a plastic spray bottle to mist on a thin coat of a patina solution, or add heavier concentrations with a sponge, brush, or cloth.
"We don't know whether that's going to have a lasting appearance effect." Most of the carbonate has been washed away, he says, but its effect on the patina left behind is yet unclear.
Liberty's green patina is the result of acomplex chemical process that researchers are just beginning to understand.