Patent ID: 7217315

Claim:
A neutral black ink for ink jet printing, comprising a mixture of at least two of the following inks: a) a neutral black ink comprising an ink vehicle and carbon black (K); b) a neutral black ink comprising an ink vehicle; carbon black (K), cyan pigment (C) and violet pigment (V); wherein the weight percent of C=0.2407·(weight percent of K) and the weight percent of V=0.188·(weight percent of K) with each weight percent number having an error margin of +/−10%; c) a neutral black ink comprising an ink vehicle; carbon black (K), cyan pigment (C) and magenta pigment (M); wherein the weight percent of C=0.424·(weight percent of K) and the weight percent of M=0.521·(weight percent of K) with each weight percent number having an error margin of +/−10%.