Abstract: The present invention provides a jet ink composition suitable for printing on substrates such as plastics messages having abrasion resistance, the composition comprising an organic solvent, a colorant, a cellulose nitrate resin, and a rosin resin. For example, the messages printed on untreated low density polyethylene and polypropylene substrates have improved rub resistance and scratch resistance. The present invention further provides a method for printing abrasion resistant messages on a surface comprising projecting a stream of droplets of the jet ink composition to the surface, controlling the direction of the stream so that the droplets are caused to form the desired printed messages, and allowing the messages to dry.

Abstract: The present invention provides jet ink compositions suitable for producing security markings on documents and other articles for subsequent identification. The jet ink composition comprises a fluorescent colorant, an ink carrier, and optionally one or more binder resins. The markings are invisible to the unaided eye and are visible only when excited by ultraviolet light. The colorant comprises a rare earth metal and a chelating ligand, is excitable by ultraviolet light having a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 550 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane. The present invention further provides a method of identifying objects comprising providing a security marking as described above, exciting the marking and reading the fluorescent emission.