Evaluation of the colorant twins for the neutral grey spectra in infrared graphic procedure/Razvoj blizanaca bojila za procedure u infrared grafici u neutralnom sivom spektru

Managing process inks in the Infrared graphics system is set through grey colour properties, based on the CMY dye synthesis. The half toning microstructure is entirely different for the colorant twins achieved in two ways, and applying inks on paper. In the visual domain colour experience is made by CMY colorants, the second within Z domain is made only with K ink. Screening composition of V and Z images created for marking in NIR domain is observed by microscope on the elementary screening cell level. Two ways of comparing the quality of colorant twins is used, visual and instrumental. Grey colorant twins are basis of dual reproduction, developing colorant twins for the neutral grey area and a big range of other colours, and especially for the procedure of hiding graphics in a visual part. Proposed are interdependent relations of basic grey tone colorant twins for determining CMY day compositions for process printing.