The Chemistry And Physics Of Dyeing; Being An Account Of The Relations Between Fibres And Dyes, The…

Paperback | May 9, 2012

byWilliam Porter Dreaper

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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. 1906 Excerpt: ...the action of acid proves equally well that the dye is free in the case of silk dyeing, for the same effect is noticed there with this dye. It is interesting to note that the natural moisture in the cotton fibre is said to be essential to colour-production. If this is removed (by alcohol) the colours are dirty and dull. It will be remembered that drying does not seem to produce this effect. The idea that the benzidine or direct colours dye because their rate of diffusion is less, is supported by the same authority. Croceine 3 B will not dye cotton, but its barium salt will do so. Fairly dark shades are produced even after washing. The rate of diffusion is said to be greatly retarded in this case. In 1894 (J.S.C.1.13. 95) I assumed a mechanicochemical theory of dyeing to be the correct one, a theory which depended primarily on a diffusion process obeying a modified form of the general laws of osmosis as then stated, supplemented by a chemical reaction or series of chemical reactions between the fibre and the dye, Fick's law being held to govern the introduction of the colour to the fibre. Zacharias (Farb. Zeit. 1901,1149) also brings this to notice, and seems to favour it. As I then pointed out, Fick's law had been verified for gelatine and agar-agar solutions. In the case of animal membranes a retarding action was noticed and the results obtained here were roughly one half those obtained by the purely osmotic pressure. The flow of the dissolved substance was hindered, but not stopped, by the organised nature of the membrane. The possible influence of dissociation on the action of dyes in solution must be considered. Briefly, the condition of electrolysis in solution has been stated as follows. Neutral salts, as a general rule, are strongly dissociated in aq...

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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. 1906 Excerpt: ...the action of acid proves equally well that the dye is free in the case of silk dyeing, for the same effect is noticed there wit...

Format:PaperbackDimensions:70 pages, 9.69 × 7.44 × 0.15 inPublished:May 9, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217620310

ISBN - 13:9780217620314

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