Patent ID: 7048790

Claim:
A black ink for inkjet recording, comprising a dye dissolved and/or dispersed in an aqueous medium, wherein the dye has a λmax of 500 to 700 nm and a half value width of 100 nm or more in an absorption spectrum of a dilute solution normalized to an absorbance of 1.0 and is a dye represented by the following general formula (1): wherein A, B and C each independently represent an aromatic or heterocyclic group, which are substituted or unsubstituted; m is 1 or 2; n is an integer of 0 or more, wherein the black ink comprises at least one metal chelating agent and has a forced fading rate constant k vis of 5.0×10 −2 [hour −1 ] or less, in which the forced fading rate constant k vis is decided by printing a black square symbol of JIS code 2223 in 48-point by using the black ink, measuring a reflection density D vis of the printed symbol through a status A filter to obtain an initial density, forcedly fading the printed symbol by an ozone fading tester capable of continuously generating 5 ppm of ozone, and determining the time taken until the reflection density D vis reaches 80% of the initial density.