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the art of engraving with acid on metal; also the print taken from the metal plate so engraved. In hard-ground etching the plate, usually of copper or zinc, is given a thin coating or ground of acid-resistant resin.
..... Click the link for more information. technique. The plate is covered with a porous ground, or resist, through which acid bites many tiny pockmarks in the metal. If an area is to be completely white, that part of the plate is coated with varnish. The plate, when inked, becomes a printing template. The tones produced resemble those of a wash drawing. The technique is said to have been invented in the 1760s by J. B. Le Prince (1734–84). It is often used in combination with other types of etching. Goya's series of mixed aquatint etchings, Los Caprichos, Desastres de la Guerra, Tauromaquia, and Proverbios, is considered a supreme example of this technique.
a type of engraving on metal. The design is applied directly to a plate with a brush that has been dipped in acid. In printing, the colors fill the areas that have been bitten away by the acid. Aquatint engravings resemble wash drawings executed with a brush. The technique was invented in the 18th century by the French artist J.-B. Le Prince.