Waterfast ink composition for printers

摘要

Liquid inks are disclosed that fulfill United States Postal Service requirements for automation compatibility, while being able to be used in an ink jet printer. The inks of this invention may be read by current United States Postal Service equipment. The inks are waterfast, having improved print quality. The formulations are based on water cosolvent solutions of soluble fluorescent or non fluorescent toners to which toning dyes and non ionic surfactants are added.