The synthetic dyestuffs : and the intermediate products from which they are derived (1905)
Cain, John Cannell, 1871-1921, Thorpe, Jocelyn Field, 1872-1940 · London : C. Griffen and Co. · leaf 251
y thecolouring matter is heated to 80° and a little salt added, so that thesolution remains slightly yellow in colour. The precipitated colour is filtered,dried, and ground. Properties.—Brown powder, dissolving in water with brownish-red colour.Dyes cotton direct from an alkaline bath, red.… … (sodium naphthionate)(2 mols.). CH3 S03Na J A N : N^JNH, NH, i N:1V CH3 S03Na (Benzopurpurine 4B). 2NaCl + 2NaHCO,
Dyes and dyeing
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