The present disclosure is drawn to an oil-based ink jet ink including a non-aqueous, oil-based liquid vehicle containing a charge control agent, the liquid vehicle having a conductivity of less than less than 50 pS/cm; from 3 wt % to 12 wt % of a pigment; from 0.5 wt % to 6 wt % of a dispersant; and from 0.001 wt % to 0.5 wt % of a high molecular weight polymer that is partially or fully solubilized in the liquid vehicle, and having a weight average molecular weight from 50,000 to 5,000,000 Mw, wherein ink jet ink has a conductivity of less than 1,000 pS/cm.