Ink containing a water-soluble phthalocyanine compound, an inkjet ink, inkjet recording method, and ozone fading improved process colored image material

摘要

PROBLEM TO BE SOLVED: To provide an ink capable of giving an image excellent in color hue and having high fastnesses to light and ozone gas, an ink for inkjet recording, containing the ink, and an inkjet recording method, and a method for enhancing the resistance of an image to ozone.;SOLUTION: The ink contains a water-soluble phthalocyanine compound, wherein the aqueous solution of the phthalocyanine compound has a spectral absorption curve on which in the ratio of the maximum absorbance (b) in the absorption band from 660 nm to 680 nm to the maximum absorbance (a) in the absorption band from 600 nm to 640 nm, the absorbance ratio b/a, is below 0.8, and wherein the counter ion of the ionic hydrophilic group of the phthalocyanine compound comprises lithium ion.;COPYRIGHT: (C)2003,JPO