Method for hot dyeing hair with compositions which are supersatu

Details Method for hot dyeing hair with compositions which are supersatu Method for hot dyeing hair with compositions which are supersatu

1985-07-01

1990-06-19

Robinson, Douglas W.

Bleaching and dyeing; fluid treatment and chemical modification

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

Hair dyeing

8405, 8406, 8428, A61K 713

Patent

active

049350323

ABSTRACT:
Method for dyeing human hair, comprising the steps of applying to hair a composition the temperature of which is higher than 30.degree. C. and lower than 50.degree. C. and which contains at least one nitro dyestuff of the benzene series supersaturated relative to its solubility limit at ambient temperature in a cosmetic medium suitable for dyeing hair and chosen from the dyestuffs having a ratio KC lim greater than 2 is aqueous solution, KC lim being the ratio of the limiting concentrations of the dyestuff in an aqueous medium which are measured at 50.degree. C. and 18.degree. C.; maintaining this composition in contact with hair either at ambient temperature or at a temperature above room temperature and below 50.degree. C., and rinsing the hair.

REFERENCES:
patent: 3168442 (1965-02-01), Brunner et al.
patent: 3733175 (1973-05-01), Alperin et al.
patent: 4470826 (1984-09-01), Bugaut et al.

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