Patent ID: 8142519

Claim:
A monoazo pigment represented by the following general formula (1), a tautomer of the monoazo pigment, and a salt or hydrate thereof: wherein R 1 , P 1 , and Q 1 each independently represents a hydrogen or a substituent, G represents the non-metallic atoms necessary to complete a 5- to 6-membered heterocyclic group, W represents a substituent capable of binding to the heterocyclic group constituted by G, t represents an integer of from 0 to 5, Het-1 represents a group selected from the aromatic heterocyclic groups represented by the following general formula (2): General formula (2) wherein X, Y, Z, W 0 , W 1 W 2 , W 3 , and W 4 each independently represents a hydrogen or a substituent, and * shows the point of attachment to the azo linkage in the general formula (1), wherein the monoazo pigment is represented by the following general formula (6): wherein R 1 represents a hydrogen or a substituent, Het-1 represents a group selected from the aromatic heterocyclic groups represented by the general formula (2), provided that * in the general formula (2) shows the point of attachment to the azo linkage in the general formula (6), and W 12 represents a hydrogen or a substituent capable of binding to the s-triazine ring.