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 301
resent, the colourwill be brown, and in this case a weak solution of sulphuric acid is stirredslowly into the hot mixture until the right point is reached. The solutionis then evaporated nearly to dryness on the water-bath, and finally driedat 50°. Properties.—Blue or bronzy powder, sparingly… … + HOI (Rosaniline blue). (Alkali blue) (free acid).
Dyes and dyeing
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