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1 December 1990 Optically variable films, pigments, and inks
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Optically variable thin film coatings have been prepared on rolls of polyester film by depositing thin multi-layers in a vacuum roll coater. Such coatings can be removed from the polyester film and ground into optically variable pigments for printing inks. Various printing inks including gravure, flexographic, and Intaglio inks have been prepared from these pigments, and printed images using these inks have been obtained from commercial printing presses. These optically variable systems have been used on various security documents to prevent counterfeiting with color copiers. Unique colors, color shifting effects, and other optical properties have been obtained by combining non-optically variable pigment and dyes with this light interference pigment. The merits of this new ink relative to other optically variable systems are color uniformity, print quality, its ready use on existing printing presses, and high security.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roger W. Phillips "Optically variable films, pigments, and inks", Proc. SPIE 1323, Optical Thin Films III: New Developments, (1 December 1990);

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