. "Colorant to be used in such inkjet recording ink must satisfy the following requirements: its solubility or dispersibility in solvent is good; it enables high-density recording; its hue is good; it is fast to light, heat, active gas in the environment (e.g., NOx, oxidizing gas such as ozone, SOx); it is fast to water and chemicals; it well fixes in image-receiving material and hardly bleeds out; i" . . .