| abstract |
The invention provides an ink composition having improved printing performance. The ink composition includes an ink vehicle, from about 0.1 to about 10% by weight self-dispersed ink pigment, from about 0.1 to about 10% by weight dye, a humectant, and a penetrant, wherein the weight ratio of ink pigment to dye ranges from greater than about 0.75:1 to less than about 2.5:1. Such ink compositions exhibit substantially improved permanence, decreased drying time, and high optical density compared to ink compositions containing only ink pigment or dye. |