INKJET BLACK INK, INK SET, INKJET RECORDING METHOD, INK CARTRIDGE, RECORDING UNIT, AND INKJET RECORDER

摘要

Disclosed is an inkjet black ink which is improved in weather resistance, optical density and fixation resistance to recording head nozzles. Specifically disclosed is an inkjet black ink containing at least a colorant and water-soluble organic solvents which is characterized in that the colorant is composed of a compound represented by the general formula (I) below or a salt thereof, the relative dielectric constant of the ink is not less than 30.0 and less than 70.0 at 20°C, and the amount of water-soluble organic solvents capable of dissolving not less than 1.0 mass% of the compound represented by the general formula (I) below or a salt thereof at 25°C is not less than 50.0 mass% of the total water-soluble organic solvents contained in the inkjet black ink.