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 162
(Violanthrene). When indanthrene green is chlorinated a deep, fast black is produced. Helianthrene (wzeso-Benzdianthrone, Scholl and Mansfeld, Ber., 1910, xliii.1734). The action of copper powder on 1 : 1 or a-dianthraquinonyl dissolvedin concentrated sulphuric acid leads to internal condensation… … (meso-Benzdian throne). The compound yields a green vat with alkaline hydrosulphite which contains thealkali salt of the dihydro derivative OH
Dyes and dyeing
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