Abstract: A liquid electrostatic developer consisting essentially of(A) a nonpolar liquid having a Kauri-butanol value of less than 30 present in a major amount,(B) thermoplastic resin particles having dispersed therein an aromatic nitrogen-containing compound which is substantially insoluble or immiscible in the nonpolar liquid at ambient temperatures as defined herein, the resin particles having an average by area particle size of less than 10 .mu.m, and(C) a nonpolr liquid soluble ionic or zwitterionic charge director compound, and process for preparation. The developer is useful in copying and color proofing including digital color proofing, lithographic printing plates and resists.