Security spot monochromatic twin dyes of infrared cartography

Abstract

The paper defines new color tones of dye pairs with identical L*a*b* (lightness color- opponent dimensions / brightness, chromaticity coordinates) values, but different responses in the infrared spectrum. Simulated through CMYK (cyan, magenta, yellow, key), spot dye tones are mixed by hand and defined for printing of large editions. The results visible with the ZGRB camera are prints of monochrome dyes with more or less Z response. The absorption of infrared light in the Z dye twin pairs is reflected in the monochromatic light and darker color gray tones. Determined are desired levels of the visibility of the Z security infrared twin pair, shown in a range of gray tones. Set are new recipes for development of multilayered offset twin dyes for design beyond the visible spectrum. The research in an extension of the infrared security print method.