| abstract |
An ink jet ink composition comprises anliquid vehicle and a water soluble dye having anfluorescent property. The fluorescent property innthis ink jet ink composition comprises a fluorescingnbrightener and results in an ink which is invisiblento the human eye when exposed to normal daylight ornincandescent light conditions, yet visible as anfluorescent image when exposed to ultravioletnlighting, and can be used in ink jet printers. |