Agent for oxidative dyeing of keratin fibers based on developers and couplers and containing at least one aldehyde of general formula (I) or (II) ##STR00001## as well as the use of the aldehydes of formula (I) or (II) for increasing the color intensity of oxidative colorants and/or for shortening the time of exposure to oxidative colorants.


> 3-aminophenol derivatives and dyes that contain these compounds while serving to dye keratin fibers

~ 00302