Patent ID: 7322688

Claim:
A method of ink jet printing comprising: jetting from an ink jet printer an ultraviolet light curable ink jet ink onto a substrate to apply a marking, the ultraviolet light curable ink jet ink having a Brookfield viscosity of between about 1 centipoise and about 50 centipoise at printing temperature, and between about 170 centipoise and about 500 centipoise at a shear rate of 20 s −1 and at a temperature of about 20° C., the ultraviolet light curable ink jet ink comprising a colorant, a photoinitiating system, and a cationic reagent, wherein the cationic reagent is a chemical, which upon exposure to a UV irradiated cationic photoinitiating system, polymerizes; waiting at least two seconds after applying the marking; and then exposing the marking to ultraviolet radiation.