The Gilder's Manual: A Complete Practical Guide to Gilding in All Its Branches : Designed for All Trades in which Gilding is Used Including Silvering : Together with Picture Framing, Picture Repairing, and Much Other Useful Information, Valuable Receipts

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Excelsior Publishing House, 1876 - Gilding - 135 pages

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Page 42 - ... of binoxide of mercury, without which the deposit of gold is red and irregular, and will not cover the soldered portions. The articles are supported by a hook or in a stoneware ladle perforated with holes, or in brass gauze baskets; they must be constantly agitated whilst in the bath. Gilders usually employ three baths, placed in close proximity to each other, and heated upon the same furnace ; the first bath is one deprived of...
Page 51 - ... prevented from doing by attaching a piece of wood across the zinc bar, to suspend it from the cover of the battery. The jar is nearly filled with water acidulated with two pounds of sulphuric acid and one ounce of nitric acid, and the battery is ready for use.
Page 88 - Baum£, 1, in which they remain for a greater or less length of time, according to the thickness of the coat of silver to be dissolved. This liquid, when it does not contain water, dissolves the silver without sensibly...
Page 61 - All these substances should be as pure as possible, and perfectly dry. Cream of tartar is generally dry : common salt often needs, before or after it has been pulverized, a thorough drying in a porcelain or silver dish, in which it is kept stirred with a glass rod or a silver spoon. The mixture of the three substances must be thorough, and effected at a moderate and protracted heat. The graining is the coarser the more common salt there is in the mixture ; and it is the finer and more condensed as...
Page 62 - The cork itself is placed upon an earthenware dish, to which a rotating movement is imparted by the left hand. An oval brush, with close bristles, held in the right hand, rubs the watch parts in every direction, but always with a rotary motion. A new quantity of the paste is added two or three times, and rubbed in the manner indicated. The more the brush and the cork are turned the rounder becomes the grain, which is a good quality ; and the more paste added the larger the grain. When the desired...
Page 55 - It is remarkable that the solutions of cyanides, even without the action of the electric current, rapMly dissolve all the metals except platinum in the cold or at a moderate temperature, and that at the boiling point they have scarcely any action upon the metals. Cold electrogilding should be done slowly ; and it is necessary to often look at the pieces in the bath, and scratch-brush those with an irregular deposit, or with dark spots. The intensity of the current should be often changed by increasing...
Page 98 - ... of turpentine, to secure adhesion. Let the whole rest until the pitch is cold. To Clean the Speculum. — Place the speculum, cemented to the circular block, face upwards, on a level table ; pour on it a small quantity of strong nitric acid, and rub it gently all over the surface with a brush made by plugging a glass tube with pure cotton-wool.
Page 57 - Small articles, such as jewellery, are kept in the right hand with the conducting wire, and plunged and agitated in the bath. The left hand holds the anode of platinum wire, which is steeped more or less in the liquor, according to the surface of the articles to be gilt. Large pieces are suspended from one or more brass rods, and are not moved about.
Page 62 - Nuremberg powder, which is produced by grinding a mixture of honey and silver foil with a muller upon a ground-glass plate until the proper fineness is obtained. The silver is separated by dissolving the honey in boiling water, and washing the deposited metal in a filter until there is no remaining trace of honey. The silver is then carefully dried at a gentle heat. "This silver, like bronze powders, is sold in small packages.
Page 99 - ... ounces thereof into the globe intended to be silvered ; the alloy should be poured into the globe by means of a paper or glass funnel reaching almost to the bottom of the globe, to prevent it splashing the sides; the globe should be turned every way very slowly, to fasten the silvering.

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