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 304
parates out. After standing fortwo hours the precipitate is filtered, washed first with alcohol, then with water, andconverted into the sodium salt by mixing it with a little hot water, carefullyneutralising with caustic soda (avoiding an excess of this reagent), and evapora-ting to dryness on the… … (phthalic anhydride). (resorcinphthalein). O
Dyes and dyeing
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