Aqueous inks are provided for use in vehicles employing from about 10 to about 40 wt % of one or more organic solvents; and optionally up to about 5 wt % of an additive independently selected from the group consisting of surfactant, buffer, biocide, and mixtures thereof. The inks comprise, by weight,...http://www.google.de/patents/US5725641?utm_source=gb-gplus-sharePatent US5725641 - Lightfast inks for ink-jet printing
