Agents for dyeing keratin fibers, containing at least one dimeric, dicationic azo dye and at least one anionic and/or cationic surfactant

An agent for dyeing keratinous fibers, the agent comprising, in a cosmetic carrier,

• (a) at least one direct dye of formula (I),
• wherein
• R1, R2, R3, R4 represent, independently of one another, a C1-C6 alkyl group, a C2-C6 alkenyl group, or a hydroxy C2-C6 alkyl group;
• R5, R6 represent, independently of one another, a hydrogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a hydroxy C2-C6 alkyl group, or a cyano C1-C6 alkyl group;
• R7, R8 represent, independently of one another, a hydrogen atom, a C1-C6 alkyl group, a halogen atom from the group consisting of chlorine, bromine, fluorine, and/or iodine, or a C1-C6 alkoxy group;
• wherein at least one of R5, R6, R7, and R8 does not represent a hydrogen atom;
• X1, X2 represent, independently of one another, a physiologically acceptable anion, chloride, bromide, iodide, methyl sulfate, methyl sulfonate, p-toluenesulfonate, acetate, hydrogen sulfate, ½ sulfate, or ½ tetrachlorozincate;
• Q represents a group of formula (II);
• *—(CH2)n-* (II)
• n represents an integer from 3 to 6;
• and
• (b) at least one anionic surfactant and/or at least one cationic surfactant.