how is fluorescent ink made?

Answer 1

It is made using functionalized fluorescent nanocrystalsPrior art fluorescent inks are known in the art to include: a fluorescent colorant, a solvent, and a binder resin; an organic laser dye that is excited by a wavelength spectrum in the near infrared range and fluoresces in an infrared range; a phenoxazine derivative dye fluorescing in the near infrared range; a rare earth metal, an organic ink carrier, and may further comprise a chelating agent; and a near infrared fluorophore and a water-dissipatable polyester.
Some of the features of fluorescent ink are:
(a) the fluorescent component of the fluorescent ink composition is water-soluble; (b) the fluorescent component is excited by a wavelength spectrum comprising UV light, and preferably in a spectral range of from about 300 nanometers (nm) to about 400 nm, and emits an narrow emission peak in a wavelength spectrum primarily in the visible range, and preferably in a spectral range of from about 410 nm to about 750 nm; (c) a plurality of fluorescent ink compositions (each containing a fluorescent component that can be detectably distinguished (e.g., by fluorescent color and/or intensity) from that of other fluorescent ink compositions of the plurality of fluorescent ink compositions) may be utilized for multicolor fluorescence by excitation with a single wavelength spectrum of light resulting in simultaneous detection of fluorescence of high quantum yield and with discrete peak emission spectra; (d) a fluorescent component that resists photobleaching (and therefore can be used for signal integration); and (e) a fluorescent component that is not susceptible to quenching.

Answer 2

By adding fluorescent pigments to the normal ink.