A technical dictionary of
printmaking, André Béguin.
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"Printmaking dictionary"
aqua
regia
nitrohydrochloric acid;
nitromuriatic acid; chlorazotic acid. Mixture of
concentrated nitric and hydrochloric acids, usually one part
of nitric acid, and three or four parts of hydrochloric
acid. Fuming yellow, corrosive, suffocating volatile liquid.
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"Printmaking dictionary"