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VERDIGRIS

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Originally appearing in Volume V27, Page 1018 of the 1911 Encyclopedia Britannica.
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VERDIGRIS , a pigment, consisting of basic See also:

copper See also:carbonates, made by acting upon copper plates with pyroligneous See also:acid soaked up in cloths, exposing the plates to See also:air, then dipping in See also:water, and finally scraping off the greenish crust; the See also:plate is re-exposed and the operation repeated till it is used up. Another method consists in exposing thin copper sheets to the acid vapours rising from the residues or " mares " of See also:wine factories, the product being scraped off, and the plate re-exposed. Both processes require several See also:weeks. The pigment appears with several shades of See also:blue and See also:green; blue verdigris is chiefly CuO•Cu(C2H3O2)2.6H2O, while See also:light blue and green verdigris contain 2CuO•Cu(C2H3O2)2.2H2O. Besides being used as a paint it is employed in See also:dyeing and See also:calico-See also:printing, and also in the manufacture of other paints, e.g. See also:Schweinfurt green, which is a See also:double See also:salt of the acetate and arsenite. A liniment or ointment is also used in See also:medicine as a cure for warts. It is an irritant See also:poison (hence the need that acid substances should never be cooked in copper utensils); the best antidote is See also:white of See also:egg and See also:milk.

End of Article: VERDIGRIS

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