SUBSTRATE FLUORESCENCE MASK FOR EMBEDDING INFORMATION IN PRINTED DOCUMENT

• Main Authors: BALA RAJA, ESCHBACH REINER
• Format: Patent
• Language: English
• Published: 13.09.2012
• Subjects: BOOK COVERS; BOOKBINDING; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR; FILES; IMPREGNATING OR COATING OF PAPER; LOOSE LEAVES; MOVABLE-STRIP WRITING OR READING APPARATUS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; SPECIAL PRINTED MATTER; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

PROBLEM TO BE SOLVED: To provide detection of forgery of, illegal change and/or duplication of documents.SOLUTION: A fluorescent mark indicator includes: a substrate containing optical brightening agents; a first colorant printed as an image on a paper substrate and providing a property of strongly suppressing substrate fluorescence, as well as a property of low contrast under normal illumination against the substrate; and a second colorant printed as an image on the substrate in substantial spatial proximity to the first printed colorant, such that the resultant colorant substrate image suitably exposed to an ultra-violet light source, yields a discernable image evident as a fluorescent mark.