Provided are an ink set and a printed article, the ink set comprising an ink jet ink A which contains a polymerizable compound, a photopolymerization initiator, and perylene black and in which a proportion of a polyfunctional polymerizable monomer in the contained polymerizable compound is 60% by mass or more, and an ink jet ink B which contains a polymerizable compound, a photopolymerization initiator, and an infrared absorbing dye and in which a proportion of a polyfunctional polymerizable monomer in the contained polymerizable compound is 60% by mass or more.

Provided are an ink set and a printed article, the ink set comprising an ink jet ink A which contains a polymerizable compound, a photopolymerization initiator, and perylene black and in which a proportion of a polyfunctional polymerizable monomer in the contained polymerizable compound is 60% by mass or more, and an ink jet ink B which contains a polymerizable compound, a photopolymerization initiator, and an infrared absorbing dye and in which a proportion of a polyfunctional polymerizable monomer in the contained polymerizable compound is 60% by mass or more.

A dye ink composition includes. a phthalocyanine compound represented by the General Formula (I), in which, in the General Formula (I), X.sub.1, X.sub.2, X.sub.3, and X.sub.4 each independently represent —N═N—Cp; Cp represents an organic group; Y.sub.1, Y.sub.2, Y.sub.3, and Y.sub.4 each independently represent a substituent; at least one of X.sub.1, X.sub.2, X.sub.3, X.sub.4, Y.sub.1, Y.sub.2, Y.sub.3, or Y.sub.4 contains an ionic hydrophilic group; a1, a2, a3, a4, b1, b2, b3, and b4 each independently represent an integer of 0 to 4; a1 +b1, a2+b2, a3+b3, and a4+b4 are each independently an integer of 0 to 4; all of a1, a2, a3, and a4 are not 0 at the same time; and M represents a hydrogen atom, a metal element, a metal oxide, a metal hydroxide, or a metal halide.

A dye ink composition includes. a phthalocyanine compound represented by the General Formula (I), in which, in the General Formula (I), X.sub.1, X.sub.2, X.sub.3, and X.sub.4 each independently represent —N═N—Cp; Cp represents an organic group; Y.sub.1, Y.sub.2, Y.sub.3, and Y.sub.4 each independently represent a substituent; at least one of X.sub.1, X.sub.2, X.sub.3, X.sub.4, Y.sub.1, Y.sub.2, Y.sub.3, or Y.sub.4 contains an ionic hydrophilic group; a1, a2, a3, a4, b1, b2, b3, and b4 each independently represent an integer of 0 to 4; a1 +b1, a2+b2, a3+b3, and a4+b4 are each independently an integer of 0 to 4; all of a1, a2, a3, and a4 are not 0 at the same time; and M represents a hydrogen atom, a metal element, a metal oxide, a metal hydroxide, or a metal halide.

Disclosed herein are compositions for three-dimensional printing. In an example, disclosed herein is a composition for three-dimensional printing comprising: (A) a powder build material; (B) a first fusing agent; (C) a second fusing agent different from the first fusing agent; (D) a detailing agent; (E) a cyan ink composition; (F) a yellow ink composition; (G) a magenta ink composition; and (H) a black ink composition.

An ink jet ink composition contains a dye having an azo group, water, and a hindered amine compound having a radical. The dissolved nitrogen concentration of the ink composition is 10 ppm or less.

An ink jet ink composition contains a dye having an azo group, water, and a hindered amine compound having a radical. The dissolved nitrogen concentration of the ink composition is 10 ppm or less.

Opaque grey ink jet ink composition, comprising: a solvent comprising one or more organic solvent compound(s); b) a binder, comprising one or more binding resin(s); wherein the ink jet ink composition further comprises: one or more black pigment(s) and/or one or more black dye(s); one or more white pigment(s); wherein the one or more black pigment(s) and/or the one or more black dye(s) is(are) present in a total amount from 0.01% to 9% by weight, of the total weight of the ink jet ink composition; wherein the one or more white pigment(s) is(are) present in a total amount from 0.5% to 30% by weight, of the total weight of the ink jet ink composition; and wherein the ratio:amount by weight of the one or more black pigment(s) and/or the one or more black dye(s)/amount by weight of the one or more white pigment(s) is from 0.001 to 1.

Opaque grey ink jet ink composition, comprising: a solvent comprising one or more organic solvent compound(s); b) a binder, comprising one or more binding resin(s); wherein the ink jet ink composition further comprises: one or more black pigment(s) and/or one or more black dye(s); one or more white pigment(s); wherein the one or more black pigment(s) and/or the one or more black dye(s) is(are) present in a total amount from 0.01% to 9% by weight, of the total weight of the ink jet ink composition; wherein the one or more white pigment(s) is(are) present in a total amount from 0.5% to 30% by weight, of the total weight of the ink jet ink composition; and wherein the ratio:amount by weight of the one or more black pigment(s) and/or the one or more black dye(s)/amount by weight of the one or more white pigment(s) is from 0.001 to 1.

An inkjet ink which can sufficiently suppress photofading of printed images and has good lightfastness, and to provide a tablet including a printed part that is printed using the inkjet ink. The inkjet ink contains Blue No. 1 as a food dye, a disaccharide whose solubility in 100 ml of water at 20° C. is in the range of 20 g or more and 39 g or less as a fixing agent, and a solvent containing water and at least one of propylene glycol and ethanol.