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Gilding Paste

Metallic sur- 3597. Boettger's Method of Gilding faces are gilt by rubbing on the following Glass. Boettger has modified Wernicke's mixture: Terchloride of gold, 36 parts; dis- process for throwing down gold on glass as solve in pure water, 36 parts, and mix with follows: He prepares the soda solution by dissolving 6 grammes (92) grains) caustic 3600. Silvering Powder. Employed soda in 100 cubic centimeters (10 gill) water; for silver coating dial plates, statuettes, and the reducing fluid, to be made when washed, other articles of copper, and covering the worn by dissolving 2 grammes (31 grains) common parts of plated goods, previously well cleaned, well cleaned, starch-sugar (glucose) in 24 grammes (370 by friction. They are made into a paste with grains) distilled water, and adding 24 cubic a little water, for use. centimeters (gill) alcohol of 80 per cent., 24 3601. Το Make Silvering Powder. cubic centimeters aldehyde of .870 specific Rub together to a fine powder 20 grains fine gravity: neutral solution of chloride of gold, 1 gramme (15.4 grains) of gold in 1,200 cubic centimeters (24 pints) water. Four volumes of the gold solution are mixed in a suitable vessel with one volume soda solution and 1.16 volumes of the reducing liquid, and the liquid rapidly poured into the hollow glass globe to be plated. Five minutes is sufficient to insure silver dust (see No. 3217), 30 grains alum, 1 drachm common salt, and 3 drachms cream of tartar; 35 grains of nitrate of silver may be substituted for the silver dust. Or: Dissolve chloride of silver in a solution of hyposulphite of soda, and make into a paste with levigated burnt hartshorn or bone dust; dry and powder it. Or: mix 1 ounce silver dust, 4 ounces the deposit of a thin film of gold, but it is bet- each of common salt and sal-ammoniac, and ter to allow more time. Flat plates of glass + ounce corrosive sublimate. In using the last, can be laid upon the surface of the liquid, as copper utensils are previously boiled with tarpreviously boiled with tarin the silvering process; the surfaces of the tar and alum, and rubbed with this paste, glass should be carefully cleaned with soda then made red -hot, afterwards polished . and alcohol, and not with acids. The greater Lastly: A good silvering powder may be part of the gold is thrown down in flocculi, made as follows: dissolve chloride of silver in and can be recovered for subsequent use the a solution of hyposulphite of soda, and mix amount deposited upon the glass being very this with prepared hartshorn or other suitable small. The mirrors are to be well washed powder. and dried in the air. Where the baths are heated, the deposition of gold takes place more rapidly, but not so fine; it is better to keep the temperature below 140° Fahr, and to allow the metal coating to form slowly.