A pigment composition contains: an azo pigment that is a reaction product between a coupler and a base; and a pigment derivative, and a content of o-anisidine derived from the coupler is less than or equal to 20 mg/kg in the entire pigment composition. A method for producing the pigment composition includes, after reaction between a coupler and a base to generate an azo pigment, or during the reaction between the coupler and the base, adding a remover for o-anisidine derived from the coupler.

The present disclosure provides a continuous process for the synthesis coupled compounds of diazonium salts including azo dyes involving in-situ generation of diazonium salts. It further discloses a set up to carry out the process for the synthesis of coupled compounds of diazonium salts.

The present disclosure provides a nano dye molecule, a color filter, and a display panel. The nano dye molecule comprises a gold nanocluster and a plurality of dye groups which are connected to the gold nanocluster by gold-sulfur bonds and cover an outer periphery of the gold nanocluster.

The present disclosure provides a nano dye molecule, a color filter, and a display panel. The nano dye molecule comprises a gold nanocluster and a plurality of dye groups which are connected to the gold nanocluster by gold-sulfur bonds and cover an outer periphery of the gold nanocluster.

The present disclosure provides a nano dye molecule, a color filter, and a display panel. The nano dye molecule comprises a gold nanocluster and a plurality of dye groups which are connected to the gold nanocluster by gold-sulfur bonds and cover an outer periphery of the gold nanocluster.

The present disclosure provides a nano dye molecule, a color filter, and a display panel. The nano dye molecule comprises a gold nanocluster and a plurality of dye groups which are connected to the gold nanocluster by gold-sulfur bonds and cover an outer periphery of the gold nanocluster.

The present invention relates to a magenta ink for inkjet recording containing at least one pigment selected from the group consisting of C.I. Pigment Red 147, 150, 176, 266 and 269, in an amount of 0.5 to 10% by mass relative to the total mass of the ink. The present invention can provide a magenta ink that is comprehensively superior in terms of light resistance, color development and storage stability. The present invention can also provide an ink set having excellent light resistance and color development for each ink included in the ink set, and an inkjet recording method that uses the ink set.

A solvent medium for diazotization reaction includes a mixed solution of polyethylene glycol and water. The molecular weight of polyethylene glycol is 200-600, and the volume ratio of polyethylene glycol and water is 1:0.4-1.5. The mixed solution also includes hydrochloric acid or sulfuric acid, and the concentration of H.sup.+ in the mixed solution is 0.32-1.72 mol L.sup.1.

The present invention relates to a magenta ink for inkjet recording containing at least one pigment selected from the group consisting of C.I. Pigment Red 147, 150, 176, 266 and 269, in an amount of 0.5 to 10% by mass relative to the total mass of the ink. The present invention can provide a magenta ink that is comprehensively superior in terms of light resistance, color development and storage stability. The present invention can also provide an ink set having excellent light resistance and color development for each ink included in the ink set, and an inkjet recording method that uses the ink set.

A solvent medium for diazotization reaction includes a mixed solution of polyethylene glycol and water. The molecular weight of polyethylene glycol is 200-600, and the volume ratio of polyethylene glycol and water is 1:0.4-1.5. The mixed solution also includes hydrochloric acid or sulfuric acid, and the concentration of H.sup.+ in the mixed solution is 0.32-1.72 mol L.sup.1.