An ink comprising a composition containing a pigment, a water-soluble resin and a liquid medium, wherein the pigment and the water-soluble resin are contained in said composition in a proportion of the weight Wr of the latter to the weight Wp of the former, Wr/Wp, that satisfies the expression (I) ##EQU1##...http://www.google.com.au/patents/US5172133?utm_source=gb-gplus-sharePatent US5172133 - Ink jet recording with an ink composition containing pigment
