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Philip Arthur Newton
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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Abstract
5582. Newton, P. A., [Farbenfabriken vorm. F. Bayer & Co.]. March 12. [Patent of Addition to No. 4423, A.D. 1908.] Dyes, artificial.-In a modification of the pro. cess of Specification No. 4423, A.D. 1908, indigo or brom- or chlor-indigos are brominated by treatment with hydrobromic acid or its salts in presence of concentrated sulphuric acid ; di-, tri-, and tetra-bromindigos and chlorbromindigos are thus obtained. Specification No. 13,430, A.D. 1902, is referred to.
GB190805582D1908-02-271908-03-12Improvements in and relating to the Manufacture and Production of Indigo Compounds
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