Composition for dyeing human hair comprising a cationic dye, a zwitterionic surfactant, and an anionic UV-absorber

Composition for dyeing of human hair in an aqueous medium, comprising

• a) 0.0001% to 2.5% by wt. of at least one cationic direct-acting hair dyestuff;
• b) 0.1% to 10% by wt. of at least one zwitterionic surfactant selected from the group consisting of
• an alkyl amido betaine of the formula (1) ##STR9## wherein R stands for a C.sub.8 -C.sub.18 -alkyl group;
• R.sub.1 and R.sub.2 denote a C.sub.1 -C.sub.4 -alkyl or hydroxyalkyl group;
• R.sub.3 represents a --COO.sup.- or --SO.sub.3.sup.- group;
• and n is 1 to 3;
• a betaine of the formula (2) ##STR10## wherein R stands for a C.sub.8 -C.sub.18 -alkyl group;
• R.sub.1 and R.sub.2 denote a C.sub.1 -C.sub.4 -alkyl or hydroxyalkyl group;
• R.sub.3 represents a --COO.sup.- or a --SO.sub.3.sup.- group;
• and n is 1 to 3;
• a compound of the formula (3) ##STR11## wherein R is a C.sub.8-20 -alk(en)yl group, R.sub.1 is an optionally hydroxysubstituted straight chain or branched-chain alkylene group with 1 to 3 carbon atoms, and n is 1 to 3, and the water-soluble salts thereof;
• a compound of the formula (4) ##STR12## wherein R is a C.sub.8 -C.sub.20 -alk(en)-yl group, R.sup.1 is an optionally hydroxysubstituted straight or branched-chain alkylene group with 1 to 3 carbon atoms, and n is 1 to 3, and the water-soluble salts thereof;
• a carboxymethyl C.sub.8 -C.sub.18 -alkyl propyl amine,
• and a C.sub.8-18 -alkyl hydroxysulfobetaine;
• and
• c) 0.1% to 5% by wt. of at least one water-soluble UV-absorbing compound bearing an anionic group, all precentages calculated to the total composition.