In order to improve the water-resisting property of an image formed on a recording medium such as recording paper and plain paper by using an ink-jet recording ink, while also improving the light-resisting property of the image, an ink-jet recording ink, which contains a color material, water, a moisture-retaining...http://www.google.com/patents/US7097698?utm_source=gb-gplus-sharePatent US7097698 - Ink-jet recording ink, ink cartridge and recording device using such ink
