Etching is an engraving technique in which acid is used to "bite" lines into a metal plate which is then printed, usually intaglio. The plate, usually copper or zinc, is first coated with a resin "ground" through which the design is drawn with a needle. Only the exposed metal is etched away. Different line thicknesses can be obtained by selective stopping out and repeated exposure to the acid.
Related category• TECHNOLOGY
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact