US Patent 7322688 Jettable ink

A printing method includes printing an ultraviolet light curable jettable ink including a colorant, a photoinitiating system, and cationic reagent onto a substrate provide a marking, and exposing the marking to ultraviolet radiation after at least two second. The ultraviolet light curable inkjet ink having Brookfield viscosity of between about 1 and 50 centipoise at printing temperature, and between about 170 and 500 centipoise at a shear rate of 20 S−1 and at a temperature of about 20° C.