Patent ID: 8342625

Claim:
A printer ink identification system comprising: a detector adapted to detect an excitable very narrow band luminescent taggant signal feature of an ink consisting of a less than 25 nm bandwidth signal, wherein the ink exhibits a background luminescent spectral output at a first maximum intensity level that is relatively wideband compared to the narrow band taggant signal, that overlaps the narrow band taggant wavelength when excited and wherein the ink also exhibits the relatively narrow band luminescent taggant signal feature spectral output at a higher second intensity level when excited, wherein the second intensity level is at least three times higher than an intensity level adjacent to the very narrow band luminescent taggant signal; an excitation source adapted to cause excitation of the excitable taggant signal feature of the ink; and a controller coupled to the detector, wherein the controller is adapted to initiate a predetermined task based, at least partially, upon input from the detector, wherein the detector is adapted to provide said input to the controller only if the second intensity is detected even when the first intensity is detected.