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 274
heated for twentyhours to 170°. After cooling, the melt is extracted with boiling water severaltimes, and the solution acidified with hydrochloric acid. The alizarine which separates out is filtered at the pump, washed with water,pressed on a porous plate, and dried at 120°. Properties.—Yellow… … + O CO (sodiumanthraquinonesulphonate). CO ONa ,ONa
Dyes and dyeing
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