Patent ID: 8172910

Claim:
An azo pigment selected from the group consisting of an azo pigment represented by the following formula (1), which has characteristic peaks at Bragg angles (2θ±0.2°) of 7.6° and 25.6° in X-ray diffraction with characteristic Cu Kα line, or a tautomer thereof, an azo pigment represented by the following formula (1), which has characteristic peaks at Bragg angles (2θ±0.2°) of 7.0°, 26.4° and 27.3° in X-ray diffraction with characteristic Cu Kα line, or a tautomer thereof, and an azo pigment represented by the following formula (1), which has characteristic peaks at Bragg angles (2θ±0.2°) of 6.4°, 26.4° and 27.2° in X-ray diffraction with characteristic Cu Kα line, or a tautomer thereof: