A perovskite ink is provided. The perovskite ink comprises a first polar solvent. The first polar solvent has a boiling point of 150° C. or more and a melting point of 30° C. or less. The perovskite ink further comprises a first light emitting perovskite material mixed in the first polar solvent at a concentration in the range of 0.01 wt. % to 10 wt. %.

Disclosed is a method of printing an ultranarrow line of a functional material. The method entails providing a substrate having an interlayer on the substrate and printing the ultranarrow line by depositing ink on the interlayer of the substrate, the ink comprising the functional material and a solvent mixture that partially dissolves the interlayer on the substrate to cause the ink to shrink and sink into the interlayer on the substrate thereby reducing a width of the line.

Disclosed is a method of printing an ultranarrow line of a functional material. The method entails providing a substrate having an interlayer on the substrate and printing the ultranarrow line by depositing ink on the interlayer of the substrate, the ink comprising the functional material and a solvent mixture that partially dissolves the interlayer on the substrate to cause the ink to shrink and sink into the interlayer on the substrate thereby reducing a width of the line.

An ink set for inkjet recording, comprising a first aqueous ink comprising a colorant stabilized by cationic dispersing groups and a capsule composed of a polymeric shell surrounding a core; the core comprising one or more chemical reactants capable of forming a reaction product upon application of heat and/or light and the capsule is stabilized by cationic dispersing groups; a second aqueous ink comprises a colorant stabilized by anionic dispersing groups and a capsule composed of a polymeric shell surrounding a core; the core comprising one or more chemical reactants capable of forming a reaction product upon application of heat and/or light and the capsule is stabilized by anionic dispersing groups.

An ink set for inkjet recording, comprising a first aqueous ink comprising a colorant stabilized by cationic dispersing groups and a capsule composed of a polymeric shell surrounding a core; the core comprising one or more chemical reactants capable of forming a reaction product upon application of heat and/or light and the capsule is stabilized by cationic dispersing groups; a second aqueous ink comprises a colorant stabilized by anionic dispersing groups and a capsule composed of a polymeric shell surrounding a core; the core comprising one or more chemical reactants capable of forming a reaction product upon application of heat and/or light and the capsule is stabilized by anionic dispersing groups.

Provided are an ink for ink jet recording, including a pigment, a water-soluble polymer for dispersing the pigment, an alkali metal salt, and a water-soluble organic solvent, in which a ratio of a content of the water-soluble polymer to a total mass of the alkali metal salt is 15 or less, and a content of the water-soluble organic solvent with respect to a total mass of the ink for ink jet recording is 18% by mass or less; a method for producing an ink for ink jet recording; and an image recording method.

Provided are an ink for ink jet recording, including a pigment, a water-soluble polymer for dispersing the pigment, an alkali metal salt, and a water-soluble organic solvent, in which a ratio of a content of the water-soluble polymer to a total mass of the alkali metal salt is 15 or less, and a content of the water-soluble organic solvent with respect to a total mass of the ink for ink jet recording is 18% by mass or less; a method for producing an ink for ink jet recording; and an image recording method.

A pigment composition for a pigment contained in ink or the like is provided, the pigment composition being capable of better preventing oxidation of the pigment from occurring in the ink or after printing, and better reducing discoloration of the pigment, even when the pigment has a small particle size such as a nanometer size. Further, a tablet and a capsule are provided. For example, the pigment composition includes: a black iron oxide; a dispersion medium; a dispersant; and an oxidation inhibitor, wherein the black iron oxide has a median diameter D50 of 30 nm or greater and 1 μm or less, and the oxidation inhibitor is reduced isomaltulose.

A pigment composition for a pigment contained in ink or the like is provided, the pigment composition being capable of better preventing oxidation of the pigment from occurring in the ink or after printing, and better reducing discoloration of the pigment, even when the pigment has a small particle size such as a nanometer size. Further, a tablet and a capsule are provided. For example, the pigment composition includes: a black iron oxide; a dispersion medium; a dispersant; and an oxidation inhibitor, wherein the black iron oxide has a median diameter D50 of 30 nm or greater and 1 μm or less, and the oxidation inhibitor is reduced isomaltulose.

A method of producing an image recorded material is a method including an image recording of sequentially applying a pretreatment liquid containing an aggregating agent, a first ink containing a first resin, and a second ink containing a second resin onto an impermeable base material to record an image, in which in the image recording, the image is recorded under a condition in which a ratio of a total applied mass of the first resin and the second resin per unit area to an applied mass of the aggregating agent per unit area in an overlapping region formed such that a region where the pretreatment liquid is applied, a region where the first ink is applied, and a region where the second ink is applied overlap each other in plan view is generated is 16.0 or greater and 30.0 or less.