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To Gild with Gold Amalgam

For gilding brass, copper, &c. The metal to be gilded is first rubbed over with a solution ens; but which, being finely pulverized and mixed with a proper quantity of grease, is spread upon the rubber cushion. This makes the surface quite glossy, and, when the glass disk has previously been wiped with a piece antly, even in damp localities where the usual arrangement fails. of nitrate of mercury, and then covered with of cotton slightly impregnated with petroleum a very thin film of the amalgam. On heat or benzine, will develop electricity abundbeing applied, the mercury volatilizes, leaving the gold behind. A much less proportion of gold is often employed than the above, where a very thin and cheap gilding is required, as, by increasing the quantity of the mercury, the precious metal may be extended over a much larger surface. (Sce No. 3394.) 3541. Boettger's Amalgam for Electrical Machines. Boettger recommends a mixture of 2 parts (by weight) of pure zinc, while melted, to be mixed with 1 part of mercury. This should be kept in pieces in a well-stoppered flask, and is said to be superior to the amalgam made of 2 parts