Patent ID: 8070867

Claim:
An ink comprising at least one coloring matter represented by a formula (1): wherein X 1 represents one of â€”CR 1 â• and a nitrogen atom; X 2 represents one of â€”CR 2 â• and a nitrogen atom; X 3 represents one of â€”CR 3 â• and a nitrogen atom; R 1 , R 2 and R 3 each independently represents one of a hydrogen atom and a substituent; when R 1 , R 2 and R 3 each represents a substituent, the substituent may have a substituent; A represents one group selected from the group consisting of monovalent substituent groups of formula (2), which may have a substituent: wherein, in the monovalent substituent groups (A-3) to (A-9) represented by the formula (2), R 11 to R 46 each independently represents one of a hydrogen atom and a substituent; when X 1 represents â€”CR 1 â• and X 2 represents â€”CR 2 â•, R 1 and R 2 may combine with each other to form a 5- to 7-membered ring; when X 2 represents â€”CR 2 â• and X 3 represents â€”CR 3 â•, R 2 and R 3 may combine with each other to form a 5- to 7-membered ring; and the coloring matter represented by the formula (1) may form one of a dimer and trimer through one of R 1 , R 2 , R 3 and A.