NCJ Number
159697
Journal
International Journal of Forensic Document Examiners Volume: 1 Issue: 3 Dated: (July/September 1995) Pages: 230-234
Date Published
1995
Length
5 pages
Annotation
This paper describes and gives examples of an invention designed to prevent the forgery and color-copying of negotiable instruments such as currency, credit cards, tickets, coupons, and others.
Abstract
The invention involves the placement of an iridescent layer on the support body of the document. When the item is copied, the iridescent layer generates colored iridescent viewing patterns that produce copies of one color and not the mixture of colors on the original item. The iridescent layer does not need to be placed on all parts of the support body. The support bodies can include paper, synthetic paper, resin film, and all their laminated forms. The print includes ordinary relief printing, intaglio, photogravure, screen, and similar methods. The method is applied to the toner images captured by electrophotographic copying methods or transference images captured by pressure-sensitive or thermo-sensitive methods. Materials for the iridescent layer can include copper iodide, aluminum fluoride, titanium oxide, silicon monoxide, silicon dioxide, and all their single-layered or multi-layered films of one kind or two or more kinds. Combinations of this iridescent layer and metal films can also be issued. Figures and seven examples