| abstract |
Provided herein is a method for dyeing keratin fibers, comprising applying to the keratin fibers, at least one composition comprising at least one compound chosen from compounds of leuco type of formula (I), dyes of azomethine type containing a pyrazolopyridine unit of formula (II) corresponding to the compounds of formula (I), mesomeric forms, isomers and tautomers thereof, and also acid-addition salts thereof and solvates thereof: |