Young's Demonstrative Translation of Scientific Secrets · Chapter 275529. Instruction for Gilding
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Dissolve a gold dollar in nitro-muriatic acid,—(2 ozs. muriatic to 1 of nitric,) then dissolve a 1/4 lb. of copperas in a pint of hot water, and pour it into the dish containing the gold and acid, pouring in a little at a time, till it stops boiling or foaming up; then let it stand and settle about six hours; then strain off the copperas-water carefully, and the gold will appear like a brown or dark yellow powder in the bottom of the dish. You will then proceed to wash the gold, which is done by pouring hot water on it; let it stand and settle a few minutes, and then drain off. Continue washing in this manner till there is no acid or copperas taste; then add to the gold in the bottom of the dish from 1-1/2 to 2 oz. cyanuret potassa, dissolved in about 1/2 pint pure soft water. The solution is then ready for use. Gild by laying a piece of pure zinc in contact with the article to be gilded, in the solution.