. . "When m and n in formula (I) each is 0, the dye preferably has a structure in which at least one of R1 to R3 and at least one of R4 to R6 each is a hydrogen atom, least one of R1 to R3 and at least one of R4 to R6 each is a group selected from a trifluoromethyl group, a substituted or unsubstituted sulfamoyl group, a group derived from a lower alkyl ester (a lower alkyl hereinafter means a C1-4 alk" . .