A technical dictionary of printmaking, André Béguin.
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lac
Resinous incrustation formed on trees of the Far East. This crust forms on their bark when they are attacked by insect parasites (Laccifer lacca). Lac comes in various forms and may he refined. Bichromated lac is used in one of the metal plate copying processes [photographic]. Lac is also used in making varnishes [gums and resins].
Lac is one of the ingredients of shellac, one of the basic products in oriental decorative arts. Shellac may be either red or black in colour.
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