By E. R. Trotman

ISBN-10: 0852641656

ISBN-13: 9780852641651

Dyeing and Chemical know-how of cloth Fibres by means of E. R. Trotman

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Methylene blue can also be used as a reagent for quantitative estimation. 4 milliinole of well-purified methylene blue hydrochloride per litre. A measured volume of the solution is then withdrawn and the remaining methylene blue is determined either calorimetrically or by titration with Naphthol Yellow S. The latter method depends upon the fact that when a solution of Naphthol Yellow S is run into one containing methylene blue, a reddish-brown precipitate is formed, the blue colour of the solution becoming less intense and finally changing to yellow.

If cotton be immersed in a cold solution of methylene blue and then rinsed with boiling water, any significant degree of staining indicates degradation. Methylene blue can also be used as a reagent for quantitative estimation. 4 milliinole of well-purified methylene blue hydrochloride per litre. A measured volume of the solution is then withdrawn and the remaining methylene blue is determined either calorimetrically or by titration with Naphthol Yellow S. The latter method depends upon the fact that when a solution of Naphthol Yellow S is run into one containing methylene blue, a reddish-brown precipitate is formed, the blue colour of the solution becoming less intense and finally changing to yellow.

Vhen cotton is boiled gently with the Fehling’s solution for about 10 minutes a red deposit of cuprous oxide can be observed either in local patches or as a uniform stain, according to the distribution of the degradation. Methylene blue test Pure cellulose has no affinity for methylene blue, but the presence of carboxyl groups associated with acidic osycellulose or residual mineral acid associated with hydrocellulose formation do cause cellulosic fibres to absorb the dye. Both qualitative and quantitative tests are based on these facts.

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Dyeing and Chemical Technology of Textile Fibres by E. R. Trotman


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