Ink for ink-jet printing

An ink composition for ink-jet printing, comprising a coloring component and a dispersion medium in which said coloring component is homogeneously dispersed and retained,

• said coloring component being insoluble in said dispersion medium, and dispersed therein in the state of finely divided particles of an average particle size of 0.01 .mu.m to 10 pm in an amount of 1-20% by weight, at least 90% of the total particles of said coloring component have particle sizes which are within .+-.50% of an average particle size thereof,
• said dispersion medium comprising a liquid having a maximum surface tension at 25.degree. C. of 50 dyn/cm, and
• said ink composition having the property that said dispersion medium separates immediately from said coloring component when said ink composition is deposited on an image-recording material.

An ink composition for ink-jet printing, comprising a coloring component and a dispersion medium in which said coloring component is homogeneously dispersed and retained, said dispersion medium comprising a non-polar insulation solvent,

• said coloring component being insoluble in said dispersion medium, and dispersed therein in the state of finely divided particles of an average particle size of 0.01 .mu.m or more in an amount of 1-20% by weight,
• said dispersion medium comprising a liquid having a maximum surface tension at 25.degree. C. of 50 dyn/cm, and
• said ink composition having the property that said dispersion medium separates immediately from said coloring component when said ink composition is deposited on an image-recording material.