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Workshop reciepts Volume 5
by: Books Group
1130022994 / 9781130022995

Book Description:
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ... them, as well as combinations of shattu-do and s/tibit-ichi in various proportions, as, for instance, in the case of /liu-shibti-ichi, the composition of which would correspond to one part of shaku-do rich in gold, and two parts of shibu-khi rich in silver. Pickling solutions are made up respectively in the following proportions, and arc used boiling:--That most widely employed ia (e). When boiled in (jr) solution, pure copper will turn a brownish red, and s/taku-do, which contains a little gold, becomes purple. Very small quantities of metallic impurity affect the colour resulting from the action of the pickle. Copper containing; a small quantity of antimony gives a shade very different from that resulting from the pickling of pure copper. But the copper produced in Japan is often the result of smelting complex ores, and the methods of purification are not so perfectly understood as in the West, The result is that the so-called "antimony" of the Japanese art metal-workers, which is present in the variety of copper called kwomi, is really a complex mixture containing tin, cobalt, and many other metals, so that a metal-worker has an infinite series of materials at command with which to secure any particular shade; and these are used with much judgment, although the scientific reasons for the adoption of any particular sample may be hidden from him. It is strictly accurate to say that each particular shade of colour is the result of minute quantities of metallic impurity. The action of these solutions is remarkable. You have copper to which a small amount of silver and a small amount of gold are added. The amount of gold may be variable, and artificers often take credit for putting in much more than analysis proves to be present; but a small amount...

Workshop reciepts Volume 5

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