Patent ID: 7288141
Filing Date: 2007-10-30
Classification: C09D

Abstract:
1. A water base ink set for ink-jet recording comprising: a pigment-based black ink containing water, a self-dispersible black pigment, and a water-soluble solvent; and a dye-based yellow ink containing water, a first water-soluble dye in which a number of counter ion or ions per one molecule is not more than 3 and a hue angle h* is 95° to 105°, and a second water-soluble dye in which a number of counter ion or ions per one molecule is not more than 3 and a hue angle h* is 75° to 85°, wherein: a weight ratio of the second water-soluble dye to the first water-soluble dye in the dye-based yellow ink is 10.0 to 100.0%; and a total content of the first and second water-soluble dyes in the dye-based yellow ink is 1.8 to 5.5% by weight.