The water-color ink which features that at least kind of the polyazo dye which possesses

摘要

PROBLEM TO BE SOLVED: To provide a water-based ink, especially an inkjet recording ink, which is capable of forming an image having good hue and excellent fastness properties to light and to the active gas in the environment, especially ozone gas, and a method for inkjet recording.;SOLUTION: The water-based ink comprises at least one kind of polyazo dyes having in the molecule at least one ionic hydrophilic group and two or more of azo groups which has a sulfur-containing, five-membered heterocyclic group. The inkjet recording ink uses this water-based ink. The inkjet recording method comprises the image formation by using this inkjet recording ink.;COPYRIGHT: (C)2005,JPO&NCIPI