Original scientific paper

https://doi.org/10.25027/agj2017.28.v29i3.166

Security spot monochromatic twin dyes of infrared cartography

Maja Matas ; Faculty of Graphic Arts University of Zagreb, Zagreb, Croatia

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 ZRGB camera are prints of monochrome dyes with more or less Z (infrared) 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 grey 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.

Keywords

spot colorants; cartographic offset print; security print; colorant twins; monochromatic tones

Hrčak ID:

227403

URI

https://hrcak.srce.hr/227403

Publication date:

5.11.2019.

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