Artificial dye-stuffs; their nature, manufacture, and uses (1917)
Ramsey, Albert R. J, Weston, H. Claude (Hubert Claude) · London, Routledge; New York, Dutton · leaf 89
mains. In carrying out this step of the process the crudeanthraquinone and sulphuric acid are placed in circularlead-hned iron pots in the proportions of one part tothree. The mass is steam-heated and agitated con-stantly for about twenty-four hours, at the end of whicha blackish product is run… … THE ANTHRACENE DYES 75 decantation, pressed and dried, the resulting productbeing 95 per cent, pure anthraquinone. The chemical action which has taken place is shownin the following structural formula of anthraquinone— O
Dyes and dyeing
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