INFRARED AND ULTRAVIOLET ACTIVE INK COMPOSITIONS
Original Publication Date: 1994-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
Disclosed is a dual image detection method which comprises formulating ink compositions containing both infrared (IR) and ultraviolet (UV) active components, printing ink images with the IR and UV active inks, and irradiating detecting with the appropriate detection means the IR and UV active ink components in the ink images. The IR and UV active ink images are optionally invisible. In combination with the respective image detection means, the IR and W images such as bar codes or mail codes can be used in printing and copying systems to enable various value added job functions in document services such as filing, hole punching, stapling, paper handling, selecting paper types, and the like. The fluorescent dyes and IR dyes useful in this are preferred to be water soluble or water miscible or water dispersible materials. The amount of each type of dye in the recording liquid can be less than 20% by weight and.preferably to be less than 5% if the absorption coefficient of the dye is high.