Discloses the use of mixtures comprising at least two structurally different bis (biphenyl) triazine derivatives of formula 1 as UV absorbers for increasing the UVA blocking index of cosmetic or dermatological compositions. <； Formula 1 >； In this formula, X is hydrogen； C 1 -C 50 alkyl which may be interrupted or interrupted by one or more oxygen atoms and / or may be substituted by one or more R 8 groups； C 3 -C 12 -cycloalkyl substituted by R 8 ； -CH ((CH 2 ) p -R 8 ) -CO-O- (CH 2 ) m -R 9 ； -CH ((CH 2 ) p -R 8 ) -CO- (NR 10 ) - (CH 2 ) m -R 9 ； ； ； -CO- (CH 2) p -R 8 ； -CO-O- (CH 2) p -R 8； -CH 2 -CH (-O (CO) -R 8 ) -R 9 ； -CO- (NR 10 ) - (CH 2 ) p -R 8 ； C 6 -C 20 aryl； Allyl； C 4 -C 50 alkenyl which is interrupted or interrupted by one or more oxygen atoms； C 3 -C 12 cycloalkyl which is interrupted or interrupted by at least one oxygen atom； C 3 -C 20 alkynyl； C 6 -C 12 cycloalkynyl； R 1 is hydrogen； Unsubstituted or substituted C 1 -C 12 alkyl； Unsubstituted or substituted C 3 -C 12 cycloalkyl； Unsubstituted or substituted C 6 -C 20 aryl； Unsubstituted or substituted C 2 -C 20 alkenyl； OR 7 ； OH； SR 8 ； SOR 7 ； SO 2 R 7 ； SO 3 H； SO 3 M； Or <； Lt； / RTI >； R 2 , R 3 , R 4 , R 5 and R 6 are independently of each other hydrogen； Hydroxyl； -CN； Substituted or unsubstituted C 1 -C 20 alkyl； Unsubstituted or substituted C 3 -C 12 -cycloalkyl； Unsubstituted or substituted C 1 -C 18 alkoxy； Unsubstituted or substituted C 4 -C 20 cycloalkoxy； C 7 -C 20 phenylalkyl； halogen； Halo-C 1 -C 5 alkyl； Sulfonyl； Carboxyl； Acylamino； Acyloxy； C 1 -C 12 alkoxycarbonyl； Aminocarbonyl； R 7 is substituted or unsubstituted C 1 -C 18 alkyl； Unsubstituted or substituted C 3 -C 12 -cycloalkyl； Unsubstituted or substituted C 6 -C 20 aryl； Unsubstituted or substituted C 2 -C 20 alkenyl； Or C 7 -C 20 phenylalkyl, and； M is an alkali metal； R 8 and R 9 independently of one another are R x when attached to a carbon atom and R y when attached to an oxygen atom； p is from 0 to 20
