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James Yate Johnson
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21,746. Johnson, J. Y., [Badische Anilin & Soda Fabrik]. Oct. 25. Dyes, artificial.-Halogenindigo is reduced to halogenindigo white by means of indigo white preferably in caustic-soda solution. The solution is freed by filtration from the indigo produced. It may be used direct for dyeing. In an example, bromindigo is added to an alkaline solution of indigo white, bromindigo white being obtained.
GB190521746D1905-10-251905-10-25Improvements in the Production of Halogenated Indigo-white.
ExpiredGB190521746A
(en)
Improvements in the Manufacture and Production of Colouring Matter of the Anthracene Series, and the Treatment and Employment thereof for Dyeing and Printing.