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verdigris

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.01 sec.
verdigris (vûr`dəgrēs'), one of three copper acetates: blue verdigris, Cu(CH3COO)2·CuO·6H2O; green verdigris, 2Cu(CH3COO)2·CuO·6H2O; or neutral verdigris, Cu(CH3COO)2·H2O; or a mixture of them. It is a poisonous gray-green to green-blue substance that is formed by the action of acetic acid on copper or copper oxide, e.g., verdigris can form on copper pots used to cook acidic foods such as tomatoes. Verdigris is used as a mordant in dyeing, as a pigment, and in making Paris green Paris green, also called Schweinfurt green, an extremely poisonous, bright green powder that was formerly used extensively as a pigment (e.g., in wallpaper) and that is sometimes used as an insecticide or to kill plant fungi; it must be used with great caution
..... Click the link for more information. . Verdigris may also be used to mean patina patina , 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
..... Click the link for more information. .
verdigris
1. a green or bluish patina formed on copper, brass, or bronze and consisting of a basic salt of copper containing both copper oxide and a copper salt
2. a green or blue crystalline substance obtained by the action of acetic acid on copper and used as a fungicide and pigment; basic copper acetate
verdigris [′vərd·ə‚grēs]
(organic chemistry)
cupric acetate
verdigris, aerugo
The greenish blue corrosion on copper that has been exposed to air for a long period of time; used as a pigment.
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The pedestal, it appeared to me, was of bronze, and was thick with verdigris.
The Time Machine by Wells, H.G. View in context
With the point of his cutlass Snider scraped the dirt and verdigris from the face of the larger ornament.
The Lost Continent by Burroughs, Edgar Rice View in context
Clips and empty cartridges, tarnished with verdigris, lay on the ground, which, while wet, had been torn up by the hoofs of horses.
The Night-Born by London, Jack View in context
 
 
 
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