Patent ID: 7270701

Claim:
An ink jet ink comprising: tris(hydroxymethyl)aminomethane; and a coloring material, wherein the coloring material is a compound represented by the following general formula (I) or a salt thereof, and a content of the coloring material is more than 3.0 mass % based on a total mass of the ink jet ink, and in a dispersion distance distribution, measured by a small-angle X-ray scattering method, of molecular aggregates in the ink jet ink whose coloring material concentration is adjusted to 0.5 mass %, a dispersion distance d 75 value corresponding to 75% of the distribution is more than 7.50 nm: wherein M represents an alkali metal or ammonium; R 1 and R 2 each independently represent a hydrogen atom, a sulfonic group, or a carboxyl group, provided that R 1 and R 2 are not simultaneously a hydrogen atom; Y represents a chlorine atom, a hydroxyl group, an amino group, or a monoalkylamino or dialkylamino group; 1 represents 0 to 2, m represents 1 to 3, and n represents 1 to 3, provided that 1+m+n=3 to 4; and positions at which substituents are present are the 4- or 4′-positions.