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James Yate Johnson
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Publication of GB190425889ApublicationCriticalpatent/GB190425889A/en
25,889. Johnson, J. Y., [Badische Anilin & Soda Fabrik]. Nov. 28. Dyeing.-Indigo and similar colouring-matters are reduced to leuco compounds, forming vats, by means of finely-divided iron in a solution of caustic soda containing not less than six and a half per cent. In examples, leuco compounds are obtained from indigo and brom-indigo.
GB190425889D1904-11-281904-11-28Improvements in the Reduction of Indigo and similar Colouring Matters.
ExpiredGB190425889A
(en)
Improvements in the Manufacture and Production of Colouring Matter of the Anthracene Series, and the Treatment and Employment thereof for Dyeing and Printing.