Ink printing method and ink-jet printing apparatus for performing printing with use of ink which performs function as a processing liquid making coloring material in other ink insoluble

An ink printing method comprising the steps of:

• employing a black ink, one of or a plurality of colored inks having higher lightness than said black ink and a low concentration colored ink which has a lower concentration than said colored ink, has a same type of color as that of said colored ink and has a polarity different from that of said black ink;
• and
• forming a black image by at least partly making said black ink, which is applied in accordance with black ink data, react with said low concentration colored ink applied in accordance with low concentration colored ink data which is generated based on said black ink data.

An ink-jet printing apparatus for performing printing comprising:

• ink ejection parts respectively ejecting a black ink, and a low concentration colored ink which has a lower concentration than a colored ink with higher lightness than that of said black ink, has a same type of color as that of said colored ink and has a polarity different from said black ink;
• and
• means for forming a black image by at least partly making said black ink, which is applied in accordance with black ink data, react with said low concentration colored ink applied in accordance with low concentration colored ink data which is generated based on said black ink data.

An ink-jet printing apparatus for performing printing comprising:

• ink ejection parts respectively ejecting a black ink, one of or a plurality of colored inks having higher lightness than said black ink and a low concentration colored ink which has a lower concentration than said colored ink, has a same type of color as that of said colored ink and has a polarity different from that of said black ink, and
• means for forming a black image by at least partly making said black ink, which is applied in accordance with black ink data, react with said low concentration colored ink applied in accordance with low concentration colored ink data which is generated based on said black ink data.

An ink set comprising:

• a low concentration colored ink which is employed together with a black ink and one or a plurality of colored inks having higher lightness than said black ink in a printing apparatus,
• the low concentration colored ink having a lower concentration than said colored ink and a same type color as said colored ink, and
• said low concentration colored ink having an opposite polarity to at least said black ink to have a function of making said black ink insoluble.

An ink set comprising:

• a black series ink;
• and
• a low concentration ink which has lower concentration than a colored ink having higher lightness than said black ink, has a same type color as said colored ink and has an opposite polarity to said black ink to have a function of making said black series ink soluble.

An ink set comprising:

• a cyan ink;
• and
• a low concentration cyan ink having an opposite polarity to a black ink to have a function of making said black ink insoluble and having lower concentration than said cyan ink.

An ink manufacturing method of manufacturing a low concentration colored ink which is employed together with a black ink and one or a plurality of colored inks having higher lightness than said black ink in a printing apparatus, has lower concentration than said colored ink and has a same type color as said colored ink has, said method comprising the steps of:

• providing a coloring material for said low concentration colored ink having an opposite polarity to said black ink to have a function of making said black ink insoluble;
• and
• adding a solvent to said coloring material to manufacture said low concentration colored ink.

A rubbing resistance improving method used when performing printing with a black ink and a low concentration colored ink having lower concentration than a colored ink which has higher lightness than said black ink, having a same color as said colored ink and having a function making said black ink insoluble, said method comprising the steps of:

• ejecting said black ink in accordance with black ink data;
• and
• ejecting said low concentration ink in accordance with low concentration colored ink data generated based on said black ink data, on said black ink after ejection of said black ink.

An ink ejection data generation method comprising the steps of:

• providing ejection data for a black ink;
• and
• generating ejection data for a low concentration colored ink having lower concentration than a colored ink which has higher lightness than said black ink, having a same type color as said colored ink and having a function of making said black ink insoluble, so that a dot pattern is formed on a printing medium in a pattern according to a predetermined algorithm, on a dot pattern of said black ink formed based on said ejection data for said black ink.

An ink printing method comprising the steps of:

• employing a black ink, one of or a plurality of colored inks having higher lightness than said black ink and a low concentration colored ink which has a lower concentration than said colored ink, has a same type of color as that of said colored ink and has a polarity different from that of said black ink;
• and
• forming a black image by at least partly making said black ink react with said low concentration colored ink without making said black ink react with said colored ink.

An ink-jet printing apparatus for performing printing comprising:

• ink ejection parts respectively ejecting a black ink, one of or a plurality of colored inks having higher lightness than said black ink and a low concentration colored ink which has a lower concentration than said colored ink, has a same type of color as that of said colored ink and has a polarity different from that of said black ink;
• and,
• means for forming a black image by at least partly making said black ink react with said low concentration colored ink without making said black ink react with said colored ink.