A cyan ink applicable to an ink set has plurality of aqueous inks each containing at least: water; a water-insoluble coloring material; and plurality of water-soluble organic solvents including a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for...http://www.google.com.au/patents/US7276110?utm_source=gb-gplus-sharePatent US7276110 - Cyan ink and ink set
