izvorni znanstveni rad
A colorant control method is set herewith targeted at obtaining the desired light absorption in three spectrum areas: the ultraviolet, visual and the infrared. Two graphics are used. The A graphic is visible in the visual spectrum only. The B graphic has two states (F and Z) that are visible in the ultraviolet (UV), and the infrared (IR) spectrum, under condition that the graphic is not visible in the visual spectrum. All the states in the graphics are brought into coordination with the CMYFIR (cyan, magenta, yellow, fluorescent and infrared) algorithm, so that they form a unique system in security printing. The UV colorant has been designed having several specific characteristics. Firstly, the color migration from the VS into the UV has been made possible, and a completely new color appears in the UV spectrum. When UV light is focused on graphic F, the brown color transits into a green that is visible in the VS as a new color. Secondly, it is possible for this same color to migrate from the VS to the IR, and in graphic B into state Z detectable with an IR camera.
security printing ; CMYFIR separation ; CMYKIR separation ; UVcolorants ; IR colorants ; F parameter
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