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To Electroplate with Silicium

(in the proportions given above for the brass), bonate of ammonia and cyanide of potassium can be obtained direct from silica: Take the In the following manner, a coating of silicium and cyanides or other compounds of nickel, can be obtained direct from silica: Take the copper, and zinc, in the requisite proportions following proportions: once, by measure, to constitute German silver. It is, however, of hydrofluoric acid, 4 ounce hydrochloric preferred to make the solution by means of acid, and 40 or 50 grains either of precipitated the galvanic battery or magneto-electric silica, or of fine white sand (the former dis- machine, as above described for brass. Should solves most freely), and boil the whole together the copper of the German silver come down for a few minutes, until no more silica is dis-in too great a for a few minutes, until no more silica is dis- in too great a proportion, this is corrected by adding carbonate of ammonia, which brings brown polish, approaching black, but entirely down the zinc more freely and should it be distinct from the well known appearance of necessary to bring down the copper in greater black-lead. If the same operation is per- If the same operation is perquantity, cyanide of potassium is added- formed on a medal that has been kept some such treatment being similar to that of the days, or upon one that has been polished, a brass before described.

Bronzing different, but very brilliant tint is produced.

The color is between red and brown. The richness of color thus produced is by many preferred to the true dark brown.