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Two-stage process for dyeing keratin fibres

  • US 4,425,132 A
  • Filed: 04/05/1979
  • Issued: 01/10/1984
  • Est. Priority Date: 04/06/1978
  • Status: Expired due to Term
First Claim
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1. Process for dyeing keratin fibres, which comprises treating the fibres with a first composition having a pH from 7 to 13, and subsequently, without any intermediate rinsing, treating the said fibres with a second composition having a pH which is less than 8 which contains a direct dyestuff which is a nitrobenzene dyestuff, anthraquinone dyestuff, triphenylmethane dyestuff, azo dyestuff, metallised dyestuff, xanthene dyestuff, acridine dyestuff or a polymeric dyestuff of the formula ##STR9## wherein R represents H or an anthraquinone dyestuff and n represents an integer from 2 to 20 and mixtures thereof.

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