The pigment dispersion encapsulated by the polymer with electrostatic and steric repulsion group was known to provide high stability so that the dispersions do not aggregate soon after impacting on the paper. So, polymer dispersed pigment dispersion showed higher jetting stability and good performance of rub fastness on treated paper, but lower optical density on non-treated paper. On the other hand, a pigment with highly oxidized surface showed contrary performance. Thus, to provide higher print quality on both treated and non-treated paper by one ink, a different system needed to be considered. Two pigments with different surface characteristic dispersed together with polymer were found to provide higher jetting stability and higher print quality (optical density and rub fastness) on both treated and non-treated papers. It was concluded that higher optical density could be achieved by adjusting the ratio of two pigments to control the ink penetration into various papers.