Hair-dyeing compositions based on nitro direct dyestuffs, and a

Details Hair-dyeing compositions based on nitro direct dyestuffs, and a Hair-dyeing compositions based on nitro direct dyestuffs, and a

1984-10-26

1985-11-26

Meyers, Albert T.

Bleaching and dyeing; fluid treatment and chemical modification

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

Hair dyeing

8428, A61K 713

Patent

active

045552479

ABSTRACT:
The dyeing compositions of the invention comprise at least one violet nitro dyestuff having a shade, on the Munsell scale, ranging from 7.5 P to 10 PB, and at least one yellow nitro dyestuff having a shade, on the Munsell scale, ranging from 10 Y to 2.5 Y, these violet and yellow dyestuffs being present in proportions such that their selectivity coefficients are substantially equal, the coefficients being from 3 to 8 when determined at a concentration of 0.1 to 0.6% by weight, the ratio by weight of the violet dyestuff to the yellow dyestuff being from 1:1 to 3:1.

REFERENCES:
patent: 3446567 (1969-05-01), Augustin et al.
patent: 3733175 (1973-05-01), Alperin et al.
patent: 4125601 (1978-11-01), Bugaut et al.
Ames et al, "Dyes are Mutagenic; Identification of a Variety of Mutagenic Ingredients", Proc. Nat. Acad. Sci., USA, vol. 72, No. 6, pp. 2, 423-2, 427 (Jun. 1975).

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