Two-stage process for dyeing keratin fibres

Details Two-stage process for dyeing keratin fibres Two-stage process for dyeing keratin fibres

1979-04-05

1984-01-10

Ore, Dale R.

Bleaching and dyeing; fluid treatment and chemical modification

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

Hair dyeing

8406, 8501, 424 47, 424 70, A61K 713, A61K 912, D06P 314

Patent

active

044251327

ABSTRACT:
A two-stage process for dyeing keratin fibres, especially human hair, is described which involves treating the fibres with a first composition at a first pH and subsequently, without rinsing treating the fibres with a second composition at a second pH, at least one of the compositions containing a dyestuff for the fibres, and the second pH being different from the first pH so as to modify the effect of at least one active ingredient on the fibres.

REFERENCES:
patent: 2085809 (1948-06-01), Lehmann et al.
patent: 3582253 (1971-06-01), Berth et al.

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