Oxidative hair dyeing process with dihydroxybenzenes and...

Details Oxidative hair dyeing process with dihydroxybenzenes and... Oxidative hair dyeing process with dihydroxybenzenes and...

A - Human Necessities

61

K

A61K 8/19 (2006.01) A61K 8/34 (2006.01) A61K 8/46 (2006.01) A61Q 5/10 (2006.01) A61K 7/13 (1990.01)

Patent

CA 2138569

A process of dyeing hair by preparing and applying to the hair an aqueous reaction medium comprising an aminoethanethiol, a dihydroxybenzene and a ferricyanide or persulfate oxidizing agent, the composition optionally containing a color modifier selected from the group consisting of direct dyes, primary intermediates, couplers and mixtures thereof, and also containing a buffer to maintain the pH in the range from 2 to 11 during the oxidation reaction, and removing the aqueous reaction medium from the hair after the desired color is attained, and compositions and kits for practicing such processes.

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