Abstract: An ink composition contains water, at least one surfactant, and a pigment. The pigment has a specific surface area of 10 m2/g or more and 50 m2/g or less as determined by pulsed NMR at 30° C.

Abstract: A printing ink composition contains a disperse dye, a dispersant, and water, in which the dispersant contains one or more compounds represented by: wherein each Ar independently represents an aromatic ring having 6 to 24 carbon atoms, R1 and R2 independently represent a substituent selected from the group consisting of H, OCH3, OH, COOH, SO3H, OSO3H, an alkyl group having 1 to carbon atoms, and a salt thereof, R3 represents a substituent selected from the group consisting of OH, COOH, SO3H, OSO3H, and a salt thereof, R4 represents a substituent selected from the group consisting of H, OCH3, OC2H5, an alkyl group having 1 to 3 carbon atoms, and a salt thereof, the substituent introduction numbers a, b, c, and d each represent an integer of 1 to 8, and the number of repetitions m represents an integer of 1 to 50.

Abstract: An ink composition contains water, at least one surfactant, and a pigment. The pigment has a specific surface area of 10 m2/g or more and 50 m2/g or less as determined by pulsed NMR at 30° C.