Patent ID: 7892386

Claim:
A liquid, radiation-curable composition comprising a substantially homogeneous fluid comprising, a fluorescing europium compound in an admixture of a polymerizable component and a polymerization initiator; the polymerizable component comprising at least one organic, free radical polymerizable component and/or at least one organic, cationic polymerizable component; the polymerization initiator comprising at least one free radical polymerization initiator and/or at least one cationic polymerization initiator; the admixture comprising a combination of an organic, free radical polymerizable component and a free radical polymerization initiator, and/or a combination of an organic, cationic polymerizable component and a cationic polymerization initiator; wherein the polymerization initiator does not contain phosphine oxide and is present in an amount sufficient to initiate the polymerization of said polymerizable component, wherein the polymerization initiator initiates the polymerization of said polymerizable component upon exposure to sufficient electron beam radiation or actinic radiation in the visible and/or ultraviolet region of the electromagnetic spectrum.