Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Patent
1992-07-31
1994-01-18
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
8405, 8407, 8408, 8409, 8410, 8414, 8416, 424 70, A61K 713
Patent
active
052796183
ABSTRACT:
A process for dyeing hair by preparing and thereafter applying to the hair an aqueous reaction medium comprising dopa and an oxidant, said aqueous reaction medium further containing at least one hair dyeing agent selected from the group consisting of primary intermediates and couplers and also containing a buffer to maintain the pH in the range from 6 to 10 during the reaction, and removing said aqueous reaction medium from the hair within about one hour following its preparation.
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Prota Giuseppe
Wenke Gottfried
Wolfram Leszek
Clairol Incorporated
Lieberman Paul
Parks William S.
Zeller Charles
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