Patent ID: 7607772

Claim:
A water-based ink set for ink-jet recording comprising a cyan ink and a blue ink, wherein dynamic surface tensions of the cyan ink and the blue ink as determined by a maximum bubble pressure method at a measurement temperature of 25° C. satisfy the following inequalities (I CB ), (II CB ), (III CB ) and (IV CB) σ 30C ≦about 49 mN/m (I CB) σ 30C +σ 30B ≦about 100 mN/m (II CB ) wherein σ 30C is dynamic surface tension of the cyan ink at a lifetime of 30 ms and σ 30B is the dynamic surface tension of the blue ink at a lifetime of 30 ms, σ 1000B ≧about 36mN/m (III CB) σ 1000C +σ 1000B ≧about70mN/m (IV CB) wherein σ 1000C is dynamic surface tension of the cyan ink at a lifetime of 1,000 ms and σ 1000B is the dynamic surface tension of the blue ink at a lifetime of 1,000 ms.