Abstract—We are demonstrating an innovation in safety technology by solving dual information for a visual and Near InfraRed spectrum. We have hidden the messages in day-to-day life situations, in offices, halls, classrooms, on the theater stage. NIR technology enables us to use double ZRGB cameras to hide and recognize the wanted information realized in a few different media. What is invisible to the naked eye becomes visible with a new visual procedure of double recording. We are publishing new recipes for pigment mixing for painting on canvas and paper materials. Light absorption properties are being respected in two areas through the twin dyes theory. The results are being demonstrated as safety print on clothes, documents and protection of artwork in painting. Keywords—Infraredesign, hidden images, twin colors, recipes for pigment, infrared art. I. INTRODUCTION UR research has been directed to the technology of hiding information in the visual scope based on material carriers; paper and canvas. Graphics print, reproduction of the painting is being demonstrated in two light areas: visual (RGB, V) and near infrared (NIR – part Z). INFRAREDESIGN (IRD) is based on using dual dyes [1]. Twin dyes are two or more dyes that have the same color in the visual spectrum and different characteristics in the near infrared spectrum. New color tones are given in the article (table 1) for digital print on the plotter. Application is the print on white and black canvas [2]. IRD prepress is being performed with screens that do not have regular geometric shapes. IRD is being applied in safety graphics [3]. IRD uses mathematical mode of screening that are being used for individualized solutions, unique, protected. Prepress algorithms are being performed in the graphic language PostScript [4]. In this paper screening equations are being shown in a conventional language of mathematics, programming relations in C++, Python languages… and in PostScript code. The first three columns in Table I are C0, M0, Y0: color twins for cyan, magenta and yellow without carbon black Vilko Žiljak is with the University of Zagreb, Faculty of Graphic Arts, Getaldićeva 2, 10000 Zagreb, Croatia (e-mail: vilko@ziljak.hr). Lidija Tepeš Golubić is with the Zagreb University of Applied Sciences, Vrbik 8, 10000 Zagreb, Croatia (e-mail: lidija75@yahoo.com). Jana Žiljak Gršić is with the Zagreb University of Applied Sciences, Vrbik 8, 10000 Zagreb, Croatia (e-mail: jana@tvz.hr). Denis Jurečić is with the University of Zagreb, Faculty of Graphic Arts, Getaldićeva 2, 10000 Zagreb, Croatia (e-mail: denis.jurecic@grf.hr). (K = 0) (in percent). Measured data for colorants with 40 percent carbon black are C40, M40, Y40. The data obtained with regression analysis are: C40r, M40r and Y40r. These data are the basis for programming textile dye separation. Table I Recipes of twin colors and dyes C0 M0 Y0 C40 C40r M40 M40r Y40 Y40r 33 33 33 7 14.74 1 6.25 2 1.10 43 95 90 2 2.78 77 74.05 65 62.13 44 81 42 17 17.31 72 65.63 8 14.47 41 39 86 18 17.34 4 8.83 71 63.20 34 95 52 0 1.47 84 87.60 36 29.32 99 43 40 90 94.70 2 2.61 2 9.45 99 99 99 77 76.95 62 64.22 81 77.33 61 35 51 48 45.37 2 -1.29 21 18.46 43 99 100 0 1.37 76 77.33 67 74.06 44 92 38 22 16.54 89 81.80 7 12.78 88 59 23 85 83.19 24 27.53 0 -4.01 70 56 36 62 55.86 23 25.93 7 4.96 45 40 30 30 30.86 9 11.18 0 -0.29 80 32 75 71 72.19 0 -9.40 45 53.03 97 55 22 93 94.10 18 19.22 0 -7.22 30 76 77 0 -1.44 59 62.08 53 58.31 35 35 35 12 16.62 5 8.00 5 3.41 50 38 99 35 32.19 7 3.65 78 83.20 45 55 99 24 24.50 22 24.41 90 85.16 45 48 99 26 25.43 18 16.48 87 84.81 50 58 99 31 31.49 29 25.86 79 86.03 II. MODEL GRID-M OF SCREENING IN SAFETY GRAPHICS New screens as a mathematical creation are being introduced. Hiding of information, picture is based on the idea of twin colors [5]. It is difficult to achieve the equality of tones of colors that have different components. A screening technique is used in the microstructure of printing. The improvement of the idea of “hiding” is being achieved with screens that do not have regular microstructures. We have lucky time in which we define the most various screens based Hidden Messages with Pigments in Dual Print for a Visual and Infrared Spectrum Vilko Žiljak, Lidija Tepeš Golubić, Jana Žiljak Gršić and Denis Jurečić O INTERNATIONAL JOURNAL OF CIRCUITS, SYSTEMS AND SIGNAL PROCESSING Volume 13, 2019 ISSN: 1998-4464 484