Abstract: Methods for detecting fraudulent documents utilizing a plurality of fluorescent snippets on the document with other encryption data printed thereon with visible and invisible inks that becomes bright when subjected to certain light. The system combines visible and invisible data that is encrypted, totaled and when subjected to a algorithm will match a selected component of said data.

Abstract: This invention relates to novel checks that are coated in a particular way with invisible fluorescent-phosphorescent inks. As the check is processed, it is subjected to a source of an ultraviolet light and conventional light which illuminates the coated areas so that the check can be imaged and the ultraviolet light makes visible the phosphorescent-fluorescent ink so that designated areas are identified. The designated areas have a code in which the computer can determine the nature of the data within the fields. The above is utilized with novel check coatings that define the designated areas but without necessarily coating them.