Patent ID: 7025815

Claim:
A composition, comprising: a dye solution comprising water and a water-soluble complex dye comprising at least one of an azo compound represented by the following formula (1) or its tautomer, and transition metal ions: wherein in the formula (1), A 1 is a 5- to 7-membered hetero monocyclic group or a fused polycyclic group containing such a hetero monocyclic group and may have an optional substituent, provided that it is a group which does not have a hydroxyl group as a substituent at a position adjacent to the carbon atom bonded to the azo group; and wherein ring X 1 represents a monocyclic 6-membered hetero ring being completely C-substituted; R 1 is a monovalent substituent and R 2 is a hydrogen or a monovalent substituent.