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To Color Gold

Gilt objects are improved by boiling in the following solution: saltpeter, 2 parts by weight; cooking salt, 1 part by weight; alum, 1 part by weight; water, 24 parts by weight hydrochloric acid, 1 part by weight (1.12 specific gravity). In order to impart a rich appearance to gilt articles, the following paste is applied: alum, 3 parts by weight; saltpeter, 2 parts by weight; zinc vitriol, 1 part by weight; cooking salt 1 part by weight; made into a paste with water. Next, heat until black on a hot iron plate, wash with water, scratch with vinegar and dry after washing.