Patent ID: 7717993

Claim:
An ink set comprising at least two or more pigment inks different in color, wherein differences in average particle size between the inks different in color are 30 nm or less, the inks each have a sedimentation rate, as indicated by equation (I), of 15% or less, and differences in the sedimentation rate between the inks different in color are 4% or less: Sedimentation rate (%)=( S 0 −S 1 )/ S 0 100 (I) wherein S 0 represents an “initial ink concentration”, which is an absorbance at a wavelength of λmax (or at 500 nm when λmax is not detected) at the time when UV spectral characteristics are measured for a 1000-fold diluted solution of the ink; and S 1 represents an “ink concentration after sedimentation”, which is an absorbance at a wavelength of λmax (or at 500 nm when λmax is not detected) at the time when UV spectral characteristics are measured for a 1000-fold diluted solution of a supernatant obtained by centrifuging the ink at 16500 G at 1.60 10 7 g·sec, wherein at least one of the pigment inks constituting the ink set contains a dispersion in which the pigment is dispersed in water with a water-insoluble resin.