The coal-tar colors : with especial reference to their injurious qualities and the restriction of their use : a sanitary and medico-legal investigation / by Theodore Weyl ; with a preface by Professor Sell ; translated with permission of the author by Henry Leffman.
- Leffmann Henry, 1847-1930.
- Date:
- 1892
Licence: Public Domain Mark
Credit: The coal-tar colors : with especial reference to their injurious qualities and the restriction of their use : a sanitary and medico-legal investigation / by Theodore Weyl ; with a preface by Professor Sell ; translated with permission of the author by Henry Leffman. Source: Wellcome Collection.
Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.
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![HSO, II. Bayer's acid. /5-naphthol-« monosu]phonic acid. These are much used in manufacturing operations. III. F-acid (L. Cassella & Co.). HSO, /3-naphthol-<J-monosulphonic acid. IV. Dahl's acid. /3-naphthol-;'-monosulphonic acid. HO HO HSO, By further treatment of these monosulphonic acids with con- centrated sulphuric acid, naphtholdisulphonic acids are ob- tained, of the /?-forms of which three isomers are known. The exact constitutional formulae are not perfectly clear. The so- called G- acid of Meister, Lucius & Briining is probably— HSO, HSO HO It forms a sodium salt soluble in alcohol (G-salt). The R-acid of Meister, Lucius & Briining, the sodium salt of which (R- salt) is insoluble in alcohol, is probably— HSO, HSO, HO It furnishes specially useful azo-colors. A third disulphonic acid (F-acid) has not yet been closely investigated. The three known isomeric a-naphtholmonosulphonic acids are of much less importance in the color-making industry than the corresponding](https://iiif.wellcomecollection.org/image/b21700588_0104.jp2/full/800%2C/0/default.jpg)
