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, tr. with permission of the author by Henry Leffman.

  • Theodor Weyl
Date:
1892
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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, tr. with permission of the author by Henry Leffman. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    nature of Martins' yellow, safranin, and methylene blue :* and I have shown the same for dinitrocresol (saffron-substitute).f NON-POISONOUS COLORS. According to Cazeneuve and Lepine's experiments the following are not poisonous to human beings and dogs: Naphthol yellow S, and certain azo-colors employed for the coloring of wine: viz., orange, ponceau R, purple, and solid yellow. According to Grandhomme, rabbits bear without injury, fuchsin free from arsenic, and other triphenylmethane derivatives (aniline colors) eosin, erythrosin and orange. Butter yellow (dimethylamidoazobenzene) produces no disturbance in rabbits. The toxic action of aurantia is in dispute, concerning which, see the Special Part. LAWS REGULATING THE USE OF POISONOUS COLORS. In spite of the facts recorded in the preceding pages, which show that the danger of poisoning from the aniline colors has been much overrated, at least as far as our present knowledge extends, most civilized countries have deemed it necessary to enact laws against the employment of the common colors in the preparation of food, drink and household articles generally. These regulations, as far as obtainable by me, are presented as an appendix to this chapter.:]: All these various legal provisions have the same purpose: to prevent the adulteration of food, * Confirmed by P. Ehrlich, by information kindly communicated verbally. Compare also the exhaustive investigation on Neurotropic colors by the same authority, Therap. Monafsh., March, 1887. t See Zeit. f. angew. Chem. 1888, No. 12, for confirmation of my results by Gerlach. X I gladly avail myself of the opportunity to express my sincere thanks to Messrs.^ Carnelutti, of Milan, Otto Hehner, of England, and E. Ludvvig, of Vienna, for furnishing me with the text of the laws concerning their respective countries.