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Robert Bolton Ransford
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3654. Ransford, R. B., [Cassella & Co., L.]. Feb. 16. Dyeing.-Deep blue shades fast to washing and light are produced on cotton by diazotizing and developing on the fibre with #-naphthol the polyazo dyes which are obtained by combining diazotized 2 : 4 : 8-naphthylamine disulphonic acid with alpha-naphthylamine, again diazotizing, combining the product with ClÞve's alpha-naphthylamine sulphonic acid, again diazotizing, and, finally, combining the product with bases of the benzene series, such as p-xylidine.
GB190303654D1903-02-161903-02-16Improvements in the Manufacture of Polyazo Bodies and Dyestuffs.
ExpiredGB190303654A
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