Hair-dyeing process using direct dyes

Details Hair-dyeing process using direct dyes Hair-dyeing process using direct dyes

A - Human Necessities

61

K

A61K 7/13 (1990.01)

Patent

CA 2066446

2066446 9103231 PCTABS00003 The new hair-dyeing process consists in applying to the hair, before or at the same time as a direct-dyeing hair dye, a preparation containing as an additive designed to increase the uniformity of development of the colour a 5- or 6-membered heterocyclic ring compound with a grouping in the ring of one of the formulae I-VI. The preferred amount of this levelling additive in the hair dye preparation is 0.1-5 % by wt. in addition to 0.05-5 % by wt. of direct-dyeing hair dye and, optionally, conventional additives.

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