Process for dyeing human hair with diazo salts and coupling comp

Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning

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8 10, 8 41R, 8 46, 8 47, A61K 713

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041659678

ABSTRACT:
Described is a process for dyeing keratin-containing material with developing dyes by applying diazo salts and coupling components successively, in any desired sequence, to the material to be dyed, and coupling them with each other, characterized in that there are used as coupling components specific derivatives of hydroxypyridine or pyridone.

REFERENCES:
patent: 3231471 (1966-01-01), Lange
patent: 3582253 (1971-06-01), Berth et al.
patent: 3955918 (1976-05-01), Lang
patent: 4025301 (1977-05-09), Lang
patent: 4065254 (1977-12-01), Buhler et al.

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