Patent ID: 7766471

Claim:
An ink set for ink-jet recording comprising a black ink comprising a black pigment, a yellow ink comprising a yellow pigment, a magenta ink comprising a magenta pigment, and a cyan ink comprising a cyan pigment, wherein an average particle size of the black pigment is from about 100 nm to about 150 nm, and an average particle size of each of the yellow pigment, the magenta pigment and the cyan pigment is from about 60 nm to about 90 nm, and wherein a dynamic surface tension of the black ink is from about 40 mN/m to about 45 mN/m, and a dynamic surface tension of each of the yellow ink, the magenta ink and the cyan ink is from about 35 mN/m to about 40 mN/m measured on the condition of 25° C. according to a maximum bubble pressure method at lifetime of 100 ms.