Symmetrical diazo compounds comprising 4-pyridinium groups...

Details Symmetrical diazo compounds comprising 4-pyridinium groups... Symmetrical diazo compounds comprising 4-pyridinium groups...

2005-12-15

2008-07-08

Elhilo, Eisa B (Department: 1796)

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Hair dyeing

C008S406000, C008S435000, C008S437000, C008S569000, C534S608000

Reexamination Certificate

active

07396368

ABSTRACT:
Disclosed herein are symmetrical cationic diazo compounds chosen from compounds of formula (I), their resonance forms, their acid addition salts, and their solvates:Also disclosed herein are dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibers, a method of coloring keratin fibers comprising contacting the keratin fibers with such compositions, and a device comprising a plurality of compartments.

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