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Oliver Imray
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8381. Imray, O., [Farbwerke vorm. Meister, Lucius, & Br³ning]. April 15. Samples furnished under Section 2 of Patents &c. Act, 1907. Dyes, artificial. - Products termed thioindigo oxides are obtained by oxidizing thioindigo dyes. According to examples, thioindigo is oxidized by concentrated nitric acid or by a mixture of sodium bichromate and sulphuric acid. Similar products are obtained from homologues of thioindigo, or chlor, brom, methoxy, ethylthio, and like substitution products thereof. The products are soluble in alkaline reducing-agents, yielding vats for dyeing ; or textile fibre may be impregnated or printed with a solution of say thioindigo oxide or dimethoxythioindigo oxide in sodium sulphite solution, and then dried and passed through dilute hydrochloric acid, red tints being thereby produced.
GB190808381D1908-04-151908-04-15Manufacture of New Products from Thio-indigo Dyestuffs
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