Abstract: Provided are: a solid solution pigment using a quinacridone pigment, the solid solution pigment being excellent in dispersibility; and an aqueous pigment dispersion liquid and an aqueous ink each using the solid solution pigment. The solid solution pigment is a solid solution pigment of C.I. Pigment Violet 19 and a first compound. The solid solution pigment is characterized in that the first compound is a compound represented by the following chemical formula (1) or a compound represented by the following chemical formula (2). In addition, the aqueous pigment dispersion liquid and the aqueous ink each include the solid solution pigment.

Abstract: Provided is a quinacridone solid solution pigment that develops a color more clearly than a conventional pigment does. The quinacridone solid solution pigment includes at least two kinds of quinacridone-based pigments including unsubstituted quinacridone and 2,9-dialkylquinacridone. When a diffraction peak intensity at a diffraction angle 2? of 5.9°±0.2° and a diffraction peak intensity at a diffraction angle 2? of 6.4°±0.2°, which are obtained by X-ray diffractometry, are represented by T1 and T2, respectively, T1 and T2 satisfy T2/(T1+T2)?0.13.