Platers' Guide Volume 6

Platers' Guide Volume 6

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...99.4 of copper, gold up to 4.16, silver to 2.06, and lead up to.11 parts, with now and again a trace of iron and arsenic. Shakudo looked like gunmetal, but when coloured by boiling in a wood-ash lye, polished with charcoal powder, and subsequently treated first in a plum-vinegar bath, and then, after washing, boiled in a solution of copper sulphate and verdigris, the resulting patina was celebrated for its sheen and velvety blacks, which constituted an ideal back for delicate inlay work. After the Japanese had beaten China in the last century, it was decided to cast medals for the troops from the captured guns. The metal had not the requisite gold in it, but his assistant at the Mint, after careful experiment. found that a beautiful black patina could be obtained from the metal melted down with a small percentage of iron-arsenic speiss in the proportion of 60 per cent. iron to 32 per cent. of arsenic. The medals from this new alloy were boiled in a solution of copper sulphate 2% grammes, verdigris 3 grammes, and water 2 liters. The finished surface was a beautiful black patina. Another art alloy, called shubuchi, was composed from silver and copper in varying proportions respectively, from 50.7 to 13.5 of silver and 49.18 to 86.48 of copper. Immersion in plum vinegar and other treatment gave in this case greys of great beauty. Smelting Copper. Professor Gowland then proceeded to discuss the smelting of copper ore as formerly practised, and still in vogue in the small mines, and claimed that prospectors would be well advised to follow the methods of Old Japan. The tatara represented a most eflicient and powerful bellows for blast. Six or eight men, half at each end, stepping alternately on and off the board, and keeping time by song, would...
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Product details

  • Paperback | 226 pages
  • 189 x 246 x 12mm | 413g
  • United States
  • English
  • black & white illustrations
  • 1236910931
  • 9781236910936