Ink-jet printer, ink cartridge for the same

An ink-jet printer comprising:

• an ink-jet head with a plurality of ink cartridges;
• a drive section which drives said ink-jet head in a going way and a returning way;
• and
• a print control section which drives said ink-jet head based on print data such that ink drops are ejected from said plurality of ink cartridges, and
• wherein each of said cartridges is filled with one ink of an ink set used in bi-directional printing, having first and second absorption quantities, wherein each of first and second absorption quantity differences are equal to or less than 10 ml/m2 in a contact time of 10 msec. in a dynamic scanning absorption meter, said first absorption quantity difference indicates difference between an absorption quantity when a first ink of said ink set is applied on a paper sheet on which a second ink of said ink set is applied and which is used for a print operation, and an absorption quantity when said first ink is applied on said paper sheet on which no other ink is applied, and said second absorption quantity difference indicates a difference between an absorption quantity when said second ink is applied on said paper sheet on which said first ink is applied, and an absorption quantity when said second ink is applied on said paper sheet on which no other ink is applied.

A method of printing data by an ink-jet printer comprising the step of:

• driving an ink-jet head in a going way and a returning way, said ink-jet head with a plurality of ink cartridges;
• and
• driving said ink-jet head based on print data such that ink drops are ejected from said plurality of ink cartridges, and
• wherein each of said plurality of ink cartridges is filled with one of an ink set used in bi-directional printing, having first and second absorption quantities, wherein each of first and second absorption quantity differences are equal to or less than 10 ml/m2 in a contact time of 10 msec. in a dynamic scanning absorption meter, said first absorption quantity difference indicates a difference between an absorption quantity when a first ink of said ink set is applied on a paper sheet on which a second ink of said ink set is applied and which is used for a print operation, and an absorption quantity when said first ink is applied on said paper sheet on which no other ink is applied, and said second absorption quantity difference indicates a difference between an absorption quantity when said second ink is applied on said paper sheet on which said first ink is applied, and an absorption quantity when said second ink is applied on said paper sheet on which no other ink is applied.