BLIZANCIMA BOJA AMBALAŽI HIDDEN INFORMATION IN TWINS COLORANTS ON PACKAGING
The mixing of process colorants is conducted on cardboard with an inkjet plotter. In the article recipes are published for colorant compositions which are presented in pairs of equal colors in the visual spectrum. Every color in the family of colors with dual properties has the same difference ΔZ in the near infrared spectrum. The difference in the absorption of light at 900 nanometers is 0.14. In visual spectrum, the twins of two colorants are defined as colors with the value of their difference ΔE less than 3. Solutions using twins of colorants in two spectra have been experimentally tested in the print on drug packaging. Quality control of the readability of the text is conducted with new infrared mini-cameras connected to a tablet.