The synthetic dyestuffs and the intermediate products from which they are derived (1920)
Cain, John Cannell, 1871-1921, Thorpe, Jocelyn Field, 1872- · London : C. Griffin · leaf 362
of the compound in dilute mineral acid :— Soluble.—The titration can be carried out direct, the colouring matteracting as its own indicator. The following example illustrates this method : Crystal scarlet 6R, C20H12N2S2O2Na2 + 7H20 (azo-dyestufF from a-naphthyl-amine and G salt).—5 gram of the… … Fig. 11. 22 338 SYNTHETIC DYESTUFFS. for about a minute. This amount required 22*6 c.c. of titanous chloridesolution for complete decolorisation calculation:— 1 c.c. TiCl3 = 0*0015797 gram Feand 502 grams colour require by theory 224 grams Fe, 0-0015797 x 22-6x 502,\ = 0-08001 gram colour Calc. and…
Dyes and dyeing
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