Agent (I) comprises at least one oxidation dye precursor and a combination of at least one or more sugar surfactants and at least one or more amphoteric surfactants, where (I), in application-ready form, contains at least 10.5 wt.% of a surfactant. Independent claims are included for: (1) a method for coloring keratin fibers comprising applying (I) from an application device as a foam, distributing (I) on the fibers, leaving (I) for a period of 1-60 (preferably 5-40) minutes on the fibers and washing (I) from the fibers； and (2) a kit, for coloring keratin fibers, comprising at least two separate agents, where the first agent comprises at least one oxidation dye precursor and the second agent comprises at least one oxidizing agent.
