Dyeing hair with melanin procursors in the presence of iodate an

Details Dyeing hair with melanin procursors in the presence of iodate an Dyeing hair with melanin procursors in the presence of iodate an

1997-05-16

1998-08-11

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

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

Hair dyeing

8406, 8408, 8423, 8432, A61K 713

Patent

active

057922209

ABSTRACT:
The present invention concerns improved processes for dyeing keratinous fibers especially hair on the human scalp using a two-step oxidation process for the oxidation of the melanin precursors 5,6-dihydroxyindoline (DHIN), 5,6-dihydroxyindole (DHI), and derivatives thereof such as 5,6-dihydroxyindole-2-carboxylic acid (DHICA).

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patent: 5173085 (1992-12-01), Brown et al.
patent: 5178637 (1993-01-01), Lagrange et al.

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