| abstract |
(57) Abstract: A water-based ink capable of filling ink into a liquid chamber and discharging bubbles with high reliability, and forming a good image in printing on plain paper, and ink-jet recording using the water-based ink. Providing a way. SOLUTION: In an aqueous ink mainly containing a colorant, water and a wetting agent dispersed or dissolved in water, a bubble frequency ν of the ink measured at 25 ° C. by a maximum bubble pressure method. A water-based ink characterized in that the relationship between [Hz] and surface tension γ [mN / m] satisfies the following conditions. [Expression 1] When 1 ≦ ν ≦ 5, 2.5ν + 27.5 ≦ γ ≦ 2.5ν + 47.5 |