A composition for the oxidation dyeing of keratin fibers, for example, human keratin fibers such as hair, comprising, in an appropriate dyeing medium, at least one oxidation dye, at least one fatty acid chosen from C.sub.10 C.sub.14 fatty acids and at least one cationic poly(vinyllactam) and dyeing methods and devices using the composition.

 
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> Composition for dyeing human keratin materials, comprising at least one fluorescent dye and at least one insoluble polyorganosiloxane conditioning polymer, process therefor and use thereof

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