Patent ID: 7252708

Claim:
A fluorescent water base ink for ink-jet recording, comprising: water; and a fluorescent dye consisting of a first fluorescent dye and a second fluorescent dye; wherein: the first fluorescent dye has a first absorption spectrum and a first fluorescence spectrum; the second fluorescent dye has a second absorption spectrum and a second fluorescence spectrum; the first absorption spectrum comprises a first ultraviolet absorption wavelength region and an additional absorption wavelength region; the first fluorescence spectrum comprises a first fluorescence emission wavelength region; the second absorption spectrum comprises a second ultraviolet absorption wavelength region; the second fluorescence spectrum comprises a second fluorescence emission wavelength region; the first ultraviolet absorption wavelength region is different from the second ultraviolet absorption wavelength region; and the additional absorption wavelength region overlaps at least a part of the second fluorescence emission wavelength region.