| abstract |
(57) [Problem] To provide an ink jet recording ink capable of realizing printing with high image density and little bleeding even by high-speed printing on plain paper. SOLUTION: In an ink jet recording ink containing at least an organic solvent, a surfactant and a coloring material, when 2 μl is dropped on plain paper having a smoothness of 100 sec or less, a) the initial contact angle is in the range of 30 to 80 °. , B) Dynamic contact angle after one second by dynamic liquid absorption measurement X = θ−θ 0 (θ is the dynamic contact angle after 1 second) is in the range of −10 ≦ X ≦ 0 (°), and c) the change rate r of the dot area after t seconds satisfying 0 <t <10 (s) t 2 / r 0 2 (r t represents the radius of the dot after t seconds) is to solve the above problems by the ink, which is a range of 1 ≦ r t 2 / r 0 2 ≦ 1.5. |