Patent ID: 8821996

Claim:
A fluorescent mark indicator comprising: a substrate containing optical brightening agents; and, an image formed on the substrate, the image formed by toggling between cells of an array, including: first cells including a first set of dots designed to fill a first pattern and comprised of first non-overlapping primary colorants providing a relatively high area coverage, the resultant first set of dots thus having a property of high suppression of substrate fluorescence, the first dot design based on a substrate coverage being less than 50% where a fractional area coverage of the primary colorants and the substrate equal 100% and an area coverage of at least one one primary colorant is at least 10%; and second cells including a second dot designed to fill a pattern and comprised of second primary colorants arranged to create a relatively low area coverage while having substantially similar average color appearance as the first set of dots under normal light, the resultant second cells thus having a property of low suppression of substrate fluorescence; wherein the low area of coverage of the second cells yield a discernable pattern evident as a fluorescent mark when the substrate is suitably exposed to an ultra-violet light source.