Patent ID: 8734530

Claim:
An agent in foam form for coloring keratin-containing fibers, in particular human hair, under induction by atmospheric oxygen, the agent comprising, in a cosmetically acceptable carrier, at an alkaline pH of 8 to 10.5: (a) as a color-forming component in the form of a dye precursor of a nature-analogous dye an indole and/or indoline derivative of formula (I), in which independently of one another R 1 denotes hydrogen, a C 1 -C 4 alkyl group or a C 1 -C 4 hydroxyalkyl group, V denotes CHR 3 and W denotes CHR 2 , such that the bond between V and W corresponds to a single bond, or V denotes CR 3 and W denotes CR 2 , such that the bond between V and W corresponds to a double bond, wherein in each case —R 2 denotes hydrogen or a —COOH group, in which the —COOH group can also be present as a salt with a physiologically tolerable cation, —R 3 denotes hydrogen or a C 1 -C 4 alkyl group, R 4 and R 5 independently of one another denote hydrogen, a C 1 -C 4 alkyl group or a —CO—R 6 group, in which R 6 denotes a C 1 -C 4 alkyl group, and/or one of the physiologically tolerable salts thereof with an organic or inorganic acid, (b) an alkalizing agent, (c) a propellant, and (d) a fatty alcohol in an amount of from about 0.1 to about 1.5 wt. % based on the total weight of the agent; wherein no additional oxidizing agent is included as a color-forming component.