Patent ID: 7824451

Claim:
A blue colored dye mixture which contains from 10 to 60 wt % with respect to the total pigment fraction of a blue pigment which is a mixture of the two isomers represented by structural formula (1) wherein one of X 1 and X 2 represents NO 2 and the other represents OH, from 60 to 10 wt % with respect to the total pigment fraction of a blue pigment represented by structural formula (2) wherein R 1 represents —C 3 H 6 OCH 3 , —C 3 H 6 OC 2 H 5 or —C 3 H 6 OC 2 H 4 OCH 3 , and from 10 to 30 wt % with respect to the total pigment fraction of the blue pigment which can be represented by structural formula (3)