Method of indicating a cure point for ultraviolet radiation curing compositions by color change

A method of indicating a cure point of an ultraviolet radiation curing composition comprising adding a non-cure inhibiting amount of a dye with a visible color to an ultraviolet radiation curable composition comprising a photoinitiator which generates free radicals upon exposure to ultraviolet radiation and at least one material which cures upon exposure to ultraviolet radiation and thereafter exposing the resulting composition to a dosage of ultraviolet radiation which causes the visible color to either disappear or change to a different color indicating that cure has occurred coincidentally, where the amount of the dye is less than 30 parts by weight per one million parts by weight of the composition and where the dye is selected from the group consisting of an anthraquinone dye having a Color Index Solvent Blue 104, 1-hydroxy-4-[(methylphenyl)amino]-9,10-anthracenedione, and an azo dye mixture of azo benzene azo naphthyl benzene amine alkyl/alkoxy derivatives having a Color Index Solvent Blue 99 and azo benzene azo naphthyl benzene amine alkyl derivatives having a Color Index Solvent Red 166.