This invention relates to an ink composition (and a method of printing therewith) comprising water, a humectant, and polymer-dye particles, wherein said polymer-dye particles comprise a colorant phase containing a water insoluble dye of formula (I), and a polymer phase, said particles being associated with a co-stabilizer ##STR00001## wherein R.sub.1 is a substituent as described in the application; R.sub.2 is a substituent as described in the application; R.sub.3 has a Pi of 0 to 1.5; and R.sub.4 has a Pi of greater than or equal to 0.6.