Ink-jet recording process, and ink set and ink-jet recording apparatus for use in such process

An ink-jet recording process comprising the steps of:

• providing a recording material,
• providing at least color inks of yellow, magenta and cyan and a black ink, and
• ejecting the inks onto the recording material to record a color image and a black image on the recording material, wherein the inks of the yellow, magenta and cyan colors contain at least a surfactant and/or a solvent which provide penetrability of the color inks into the recording material and a salt, and the black ink comprises a pigment, a water-soluble solvent, water and a dispersant for dispersing the pigment, which black ink causes viscosity increase or aggregation by dispersion breaking with the salt, and wherein the black ink and the color inks overlap each other on the recording material.