Patent ID: 7800785

Claim:
Method for creating a fluorescence mark indicator comprising: selecting a desired colorant combination from within an available color gamut; deriving a first dot design pattern to provide the desired colorant combination, the first dot design pattern comprised of substantially non-overlapping primary colorants arranged so as to provide a relatively high paper coverage, the resultant first dot design pattern thus having a property of high suppression of substrate fluorescence; deriving a second dot design pattern to also provide the desired colorant combination for printing, the second dot design pattern further comprised of primary colorants arranged to create a relatively low paper coverage while having substantially similar average color appearance as the first dot design pattern under normal light, the resultant second dot design pattern thus having a property of low suppression of substrate fluorescence; and, printing the first dot design pattern and the second dot design pattern in close proximity to each other on a substrate containing optical brightening agents such that the resultant printed substrate image suitably exposed to an ultra-violet light source, will yield a discernable pattern evident as a fluorescent mark.