Patent ID: 8770735

Claim:
An inkjet recording ink comprising: a pigment dispersion liquid, comprising a first carbon black and a dispersant, a second carbon black, a penetrant, a wetting agent, a polyoxyalkylene derivative of the formula: C 18 H 27 (C 2 H 4 O) n H, wherein n is from 8 to 9, and water, wherein the first carbon black has an average particle diameter D50 of from 70 nm to 180 nm as measured by a dynamic light scattering method and has a particle diameter standard deviation equal to or smaller than 1/2 of the average particle diameter, the dispersant is a condensate of naphthalene sulfonic acid and formalin, the second carbon black is carbon black coated with a resin, and the penetrant is 2-ethyl-1,3-hexandiol.