Inkjet recording ink and ink cartridge

An ink cartridge comprising:

• an inkjet recording ink, and
• a container,
• wherein the inkjet recording ink is housed in the container,
• wherein the inkjet recording ink comprises a pigment dispersion liquid comprising a first carbon black and a dispersant, a second carbon black, a penetrant, a wetting agent, and water,
• 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,
• the penetrant is 2-ethyl-1,3-hexandiol, and
• the inkjet recording ink comprises a polyoxyalkylene derivative of the formula:
• C18H27(C2H4O)nH,
• wherein n is from 8 to9.