Abstract: A security document comprises a document substrate and a pattern of repeated geometric shapes printed on the document substrate. The pattern of repeated geometric shapes comprises a first set of the geometric shapes printed using a reactive ink and a second set of the geometric shapes printed using a non-reactive ink. The geometric shapes fit closely together without substantial overlaps. In addition, a visual appearance of the reactive ink is substantially similar to a visual appearance of the non-reactive ink. The first set of geometric shapes or the second set of geometric shapes are arranged together to form one or more hidden symbols, pantographs or messages. A method of printing the security document is also disclosed.

Abstract: This invention relates to economically enhancing document security on printed forms such as checks, money orders, prescription pads, grade reports etc. by the overprinting of a layer of neon fluorescent printing ink(s) in varying densities in predetermined patterns on any document where authentication and verification of the original is necessary. A new economical printing process to increase document security (from duplication, counterfeiting, tampering or washing) by the use of neon fluorescent ink(s), printed onto paper in predetermined patterns and densities, whereby allowing the design to perform dramatic transformations under ultraviolet light and through electronic scanning.