Elements of the Art of Dyeing and Bleaching

Elements of the Art of Dyeing and Bleaching

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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. 1841 edition. Excerpt: ... The black thereby obtained is, in reality, merely a very deep but durable violet. This is the most ordinary process. If yellows. or greys be wished for along with the black, sumach is made use of. When cloths are to have only black and white colours, a decoction of logwood is employed, which affords a finer and less costly black, but one a little less durable. We have ascertained, that by imitating these processes, adding a little acetate of copper, making a mixture of different astringents, and substituting the pyrolignous for the ordinary allidllbla-cks may readily be produced of a satisfactory beauty, whose vivacity is increased at the same time that the harshness derivedifrom the dye is diminished, by means of the oil with which the stuff is impregnated. CHAPTER III. Of Grey. THE shades of black are grey, from the brownest to the lightest. The greys may be made in two modes. 1. A decoction of pounded gall-nuts is prepared, and the sulphate of iron is separately dissolved. A bath is made corresponding to the quantity of stuff, which is to be dyed of the lightest shade; and when it is as hot as the hand can bear, the decoction of nutgalls, and the solution of sulphate are poured into it. The wool or stuff is then turned through it. When it has come to the wished-for shade, it is withdrawn; and some decoction and solution are added to the same bath. A stuff is turned through this, to give it a deeper shade than the preceding. Thus the operation is continued to the brownest shades, always adding more of the two liquors. But it is better for the black-grey, and the other deep shades, to give previously to the stuff a stronger or weaker blue ground. The second mode of making grey, which Hellot found to be preferable to the one just...show more

Product details

  • Paperback | 208 pages
  • 187.96 x 243.84 x 12.7mm | 385.55g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236843371
  • 9781236843371