Abstract: A biological material extraction magnetic bead contains: a magnetic metal powder; an inorganic oxide layer that covers a particle surface of the magnetic metal powder and contains an inorganic oxide; a base layer that covers a surface of the inorganic oxide layer and contains a gold ion reducing agent or a catalyst for a gold ion reduction reaction; a gold layer that covers a surface of the base layer and contains gold; and an immobilization layer that is bonded to a surface of the gold layer via an Au—S bond and contains a compound having a ligand or a ligand binding site.

Abstract: A water-based coloring composition contains a metal pigment, water, and an organic solvent. The metal pigment is surface-treated with a first surface treatment agent and a second surface treatment agent, the first surface treatment agent contains a phosphonic-acid-based compound denoted by Formula (1) or a phosphoric-acid-based compound denoted by Formula (2), the second surface treatment agent contains a phosphonic-acid-based compound denoted by Formula (3) or a phosphoric-acid-based compound denoted by Formula (4), and the carbon number of R1 or R2 of the first surface treatment agent is higher than the carbon number of R3 or R4 of the second surface treatment agent.

Abstract: Provided is a recording method including an adhesion step of jetting an ink composition from an ink jet head and making the ink composition adhere to a recording medium, and a primary heating step of heating the recording medium in the adhesion step, in which the adhesion step includes a step in which a jetting frequency of the ink composition is 15 kHz or greater, the ink composition contains a metal pigment and a solvent component, the solvent component contains an organic solvent, and the metal pigment is a metal particle that has a scaly shape and has a surface treated with a compound represented by Formula (1) or Formula (2). (R1—)P(O)(OH)2??(1) (R2—O—)aP(O)(OH)3?a??(2) (In the formulae, R1 and R2 each independently represent a hydrocarbon group having 14 or more carbon atoms which may be substituted with a substituent, and a represents 1 or 2.

Abstract: An ink jet ink composition contains a metal pigment and at least one liquid medium selected from the group consisting of organic solvents and water. The metal pigment is surface-modified with a surface treatment agent. The metal pigment is in the form of scale-like particles and has a volume average particle size D50 of 1.0 ?m or less. The ratio D50/Z of the volume average particle size D50 of the metal pigment to the average thickness Z of the metal pigment particles is 17 or more, and the ratio D50/L of the volume average particle size D50 to the nozzle diameter L of the ink jet head is 0.050 or less.

Abstract: A pigment composition according to an embodiment contains a base-metal pigment, at least one dispersant, and water. The base-metal pigment is metal particles having a surface treated with at least one compound represented by formula (1) or (2): (R1—)P(O)(OH)2 ??(1) (R2—O—)aP(O)(OH)3-a ??(2) where R1 and R2 independently represent a hydrocarbon group haying 12 or more carbon atoms, optionally substituted with one or more substituents, and a is 1 or 2. The dispersant includes an amine compound haying a polyester structure, and the pigment composition is an aqueous one.

Abstract: An aqueous coloring composition contains a metal pigment, water, and organic solvents. The metal pigment is metal particles having a surface treated with at least one compound represented by formula (1) or (2), and the organic solvents include an organic solvent (A), having a water solubility of 1000 g/L or more at 20° C., and an organic solvent (B), having a water solubility of 100 g/L or less at 20° C. (R1—)P(O)(OH)2??(1) (R2—O—)aP(O)(OH)3-a??(2) (In the formulae, R1 and R2 independently represent a hydrocarbon group having 12 or more carbon atoms, optionally substituted with one or more substituents, and a represents 1 or 2.

Abstract: An aqueous coloring composition contains a metal pigment and a solvent component. The metal pigment is metal particles having a surface treated with at least one surface treatment agent, and the solvent component includes water and at least one organic solvent. The coordinate-to-coordinate distance between the HSP coordinates of the surface treatment agent and those of the solvent component is 4.5 or less.

Abstract: An aqueous coloring composition contains a metal pigment and water. The metal pigment is metal particles having a surface treated with at least one surface treatment agent, and the surface treatment agent is at least one compound represented by general formula (1) or (2). The volume-average particle diameter D50 of the metal pigment is 9 ?m or less. (A1-R1—)P(O)(OH)2??(1) (A2-R2—O—)aP(O)(OH)3-a??(2) (In the formulae, A1 and A2 each independently represent a hydrogen atom or a group selected from a carboxyl group, a hydroxyl group, an amino group, and an oxyalkylene-containing group, R1 and R2 each independently represent a hydrocarbon group having 12 or more carbon atoms, and a represents an integer of 1 or 2.

Abstract: According to an embodiment of the present disclosure, provided is an ink jet ink composition which is a solvent-based ink, the composition including a metal pigment and an organic solvent, in which the metal pigment is a metal particle having a surface treated with a surface treatment agent, the surface treatment agent contains a compound represented by General Formula (1) and a compound represented by General Formula (2), and a mass ratio of a mass of the compound represented by General Formula (2) to a total mass of the compound represented by General Formula (1) and the compound represented by General Formula (2) is 45% by mass or less. (R—O—)P(O)(OH)2??(1) (R—O—)2P(O)(OH)??(2) (In the formulae, R's each independently represent a hydrocarbon group having 8 or more carbon atoms.

Abstract: A coloring composition of the present disclosure includes a metal pigment; an acrylic-based resin having an acid value of 200 mgKOH/g or less; and a liquid medium component, the metal pigment includes metal particles, the metal particles are surface-modified with a surface treatment agent, and the surface treatment agent includes at least one selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2).

Abstract: A metal pigment composition of the present disclosure is a coloring composition or a composition to be used for preparation of the coloring composition and includes: a metal pigment; a polyoxyalkyleneamine compound; and a liquid medium component, the metal pigment includes metal particles, the metal particles are surface-modified with a surface treatment agent, and the surface treatment agent is at least one selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2).

Abstract: An ink jet ink composition containing a metal pigment, and a liquid medium component, in which the metal pigment is made of a metal particle, the metal particle is surface-modified with a surface treatment agent, the surface treatment agent is at least one selected from the group consisting of a compound represented by formula (1) below and a compound represented by formula (2) below, and the ink jet ink composition is a water-based ink or a solvent-based ink: (R—O)aP(O)(OH)3-a ??(1) (R)P(O)(OH)2 ??(2) where R is independently a hydrocarbon group having a carbon skeleton having 13 or more carbon atoms, and a is 1 or 2.