Method and composition for coloring a keratinous substrate using solubilized vat dyes
AssigneeWella Germany GmbH
InventorsSonja Telser, Ingo Weber, Petra Braun, Markus Speckbacher
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Abstract
The disclosure relates to methods for coloring keratinous substrates using solubilized vat dyes, as well as compositions and kits suitable for carrying out the methods. The disclosure also relates to novel solubilized vat dyes.
Claims24
A method for coloring a keratinous substrate, comprising:
- a1. applying a composition A to said keratinous substrate, said composition A comprising an aqueous medium and a solubilized vat dye dissolved in said medium, wherein said solubilized vat dye is a leuco vat dye sulfuric ester, and wherein composition A is essentially free of oxidative dye precursors selected from primary intermediates and couplers,
- b1. applying a composition B to said keratinous substrate, said composition B having a pH in the range of 3.0-5.0.
A method for correcting a brassy color shade or hue of mammalian hair, comprising:
- a2. applying a composition AA to the hair, said composition AA comprising an aqueous medium and a solubilized vat dye dissolved in said medium, wherein said solubilized vat dye is a leuco vat dye sulfuric ester, and wherein composition AA is essentially free of oxidative dye precursors selected from primary intermediates and couplers,
- b2. applying a composition BB to the hair, said composition BB having a pH in the range of 3.0-5.0.
A composition for coloring a keratinous substrate, comprising an aqueous medium and a solubilized vat dye dissolved in said medium, wherein said solubilized vat dye is a leuco vat dye sulfuric ester, said vat dye selected from anthracene dyes, anthraquinone dyes, naphthalene dyes, violanthrone dyes, tetraaza-violanthrone dyes, acridine dyes, pyrene dyes, dibenzo[a,h]pyrenes, perylene dyes, terrylene dyes, quaterrylene dyes, wherein said composition is essentially free of oxidative dye precursors selected from primary intermediates and couplers, wherein said composition is essentially free of reducing agents capable of forming an enediol, and wherein said composition is essentially free of sulfur-containing nucleophiles.
Dependencies are inferred from the claim text.