VERDIGRIS

This article appears in Volume V27, Page 1018 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: VAN-VIR

VERDIGRIS , a pigment, consisting of basic copper carbonates, made by acting upon copper plates with pyroligneous acid soaked up in cloths, exposing the plates to air, then dipping in water, and finally scraping off the greenish crust; the

plate

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 wine factories, the product being scraped off, and the

plate

PLATE

re-exposed. Both processes require several weeks. The pigment appears with several shades of blue and green; blue verdigris is chiefly CuOCu(C2H3O2)2.6H2O, while light blue and green verdigris contain 2CuOCu(C2H3O2)2.2H2O. Besides being used as a paint it is employed in dyeing and

calico

CALICO

-printing, and also in the manufacture of other paints, e.g.

Schweinfurt

SCHWEINFURT

green, which is a

double

salt

of the acetate and arsenite. A liniment or ointment is also used in

medicine

MEDICINE

as a cure for warts. It is an irritant poison (hence the need that acid substances should never be cooked in copper utensils); the best antidote is

white

of egg and milk.

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