An ink comprising an aqueous liquid medium which contains acid carbon black having a volatile content within the range of 3.5 to 8% by weight and a water-soluble resin having a weight average molecular weight within the range of 3,000 to 30,000, wherein the weight ratio of the acid carbon black to the...http://www.google.fr/patents/US5184148?utm_source=gb-gplus-shareBrevet US5184148 - Ink jet recording having an ink with carbon black
