Patent ID: 7370953

Claim:
An inkjet recording ink comprising: an aqueous medium comprising at least one water-miscible organic solvent; and at least one dye dissolved and/or dispersed in the aqueous medium, wherein said at least one dye has a maximum absorption spectrum λmax at a wavelength range of from 390 nm to 470 nm and a I(λmax+70 nm)/I(λmax) ratio of not greater than 0.4, in which I(λmax) is the absorbance at λmax and I(λmax+70 nm) is the absorbance at λmax+70 nm, wherein the inkjet recording ink exhibits an accelerated fading rate constant of not greater than 5.0×10 2 [hour −1 ], in which the accelerated fading rate constant is determined by printing the ink on a reflection medium to prepare a printed matter, measuring a reflection density through a status A filter to define an initial value of reflection density (D B ) in the yellow region by one point between 0.90 and 1.10, and acceleratedly fading the printed matter by using an ozone fading tester capable of always generating 5 ppm of ozone, so as to define the fading rate constant from the time required until the reflection density reaches 80% of the initial value; and said at least one water-miscible organic solvent satisfies one of the following requirements 1) and 2): 1) said at least one dye has a solubility in all of said at least one water-miscible organic solvent of less than 10 (g/100 g) at 25° C.; 2) said at least one dye has a solubility in at least one of said at least one water-miscible organic solvent of not smaller than 10 (g/100 g) at 25° C., with the proviso that the sum of the weight of the water-miscible organic solvent is not greater than 10% of the weight of the ink.