Color reproduction on transparent multilayer films has a wide range of applications in the packaging production. In case of using multi-layer films as decorative or protective elements in packaging production, deviations may occur in color reproduction process due to the pleochroism in multilayer polymeric materials. The purpose of the work is Determination of the conditions of the color effect and measuring the parameters of it in the passing polarized light on film materials with the effect of pleochroism. The object of the study was the model Stoletov pile 77 cm long, 40 cm wide, consisting of 13 layers of polypropylene. Magenta and yellow ink layers were applied to the considered sample in the form of stripes by jet printing UV-curing inks and subsequent photofixation of the examinations was studied. The color difference Δε was calculated by processing photos in the Paint 3D program, followed by the translation of color coordinates from the RGB color space into the Lab system. Subsequently, the δε was calculated between the original sample and the sample placed under the Stoletov pile between two polarized films. The results of the work were the establishment of qualitative and quantitative differences in the color of the translucent layers of CMYK on the multi -layer film of polypropylene in the natural and polarized light, as well as the determination of the maximum calculated difference achieved for yellow with natural and polarized lighting under 12 layers of the Model pile, the maximum difference between the Cian color with the density of filling the halftone dot of the print 50%, reached under 6 layers of the model pile, and the maximum difference between the magenta sample with the density of filling the halftone dot 50%reached under 8 layers of the model pile.

1. Quality Packaging as an Important Element of Product Promotion Strategy. LKM. 2005. no. 11. p. 45. (in Russian)

2. Vilkova S.A. Counterfeiting of Household Chemical Goods: Problems, Types and Methods. LKM. 2003. no. 2-3. p. 71. (in Russian)

3. Vilkova S.A. Identification Procedure for Authenticity of Household Chemical Products. LKM. 2003. no. 4. p. 36 38. (in Russian)

4. Vesnina S.N., Neustroeva A.V., Stepanyugin K.V. New Security Features Technologies of Australian Dollar as Counterfeit Prevention Measure. Society: Politics, Economics, Law. 2020. (in Russian)

5. Weber M.F., Nevitt T.J., Merrill W.W. Color-Changing Film. Patent CN1293613A, 2001-05-02. Available at: https://worldwide.espacenet.com/patent/search/family/021721628/publication/CN1293613A

6. Color Shifting Film Articles (Multilayer Polymer Films and Other Optical Bodies Useful for Making Colored Mirrors and Polarizers). Patent US2003035972A1. Available at: https://worldwide.espacenet.com/patent/search/family/021721628/publication/US2003035972A1

7. Oleari C. Optical Thin Films and Coatings. In: Electronic and Optical Materials. Parma, Italy: Woodhead Publishing Series, 2013. p. 391-424.

8. Krichevsky G.E. Structural Coloring. Chemistry and Life. 2010. no. 11. p. 13-16. (in Russian)

9. Kozenkov V.M., Spakhov A.A., Belyaev V.V., Chausov D.N. Optically Anisotropic and Interference Security Features: Properties, Technology, Applications. Liquid Crystals and Their Practical Applications. 2016. vol. 16, no. 4. p. 9-21. (in Russian)

10. Nikolaev A.A., Ermakova I.N., Kondratov A.P. Color Variation Range of Multilayer Polymer Packaging Security Elements Identifiable in Polarized Light. Proceedings of Tula State University. Technical Sciences. 2017. no. 12. p. 77-83. (in Russian)

11. Kamanina N.V., Studentov V.I., Tkachev A.G. Thin-Film Light Polarizers: Medium Structuring and Surface Modification. Liquid Crystals and Their Practical Applications. 2020. vol. 20, no. 4. p. 78-83. (in Russian)

12. Andrutskaya O.M. Color Spectacle. LKM. 2015. no. 1-2. p. 56-59. (in Russian)

13. Kondratov A.P., Nikolaev A.A., Nazarov V.G., Vereshchagin V.Yu., Volinsky A.A. Design and Multilevel Structuring of Shape Memory Polymers for Pleochroism Control. Journal of Applied Polymer Science. 2023. vol. 140, no. 41. doi: 10.1002/app.54532.

14. Li G., Leng M., Wang S., Ke Y., Luo W., Ma H., Guan J., Long Y. Printable Structural Colors and Their Emerging Applications. Materials Today. 2023. vol. 69. p. 133-159. doi: 10.1016/j.mattod.2023.08.022.

15. Nikolaev A.A., Kondratov A.P. Hidden Marking of Transparent Polypropylene Film. Fine Chemical Technologies. 2022. vol. 17, no. 4. p. 346-356. doi: 10.32362/2410-6593-2022-17-4-346-356. (in Russian)

16. Das B., Mohanty S. A Comprehensive Review on Piezoelectric Inks: From Concept to Application. Sensors and Actuators A: Physical. 2024. vol. 366. p. 114939. doi: 10.1016/j.sna.2023.114939.

17. Rafiei A., Karimi A., Bodaghi M. Polymer Banknotes: A Review of Materials, Design, and Printing. Sustainability. 2023. vol. 15, no. 4. p. 3736. doi: 10.3390/su15043736.

18. The Influence of Printing Substrate on Colorimetric Properties of Thermochromic Offset Prints. Acta Graphica. 2019. vol. 29, no. 3. p. 7-13. doi: 10.25027/agj2017.28.v29i3.161.

19. Yoon B., Ham D.-Y., Yarimaga O., An H., Lee C.W., Kim J.-M. Inkjet Printing of Conjugated Polymer Precursors on Paper Substrates for Colorimetric Sensing and Flexible Electrothermochromic Display. Advanced Materials. 2011. vol. 23, no. 46. p. 5492-5497. doi: 10.1002/adma.201103471.

20. Solomonov A., Kozell A., Tesler A., Pinkas I., Walensky S., Shimanovich U. Flexible Soft-Printed Polymer Films with Tunable Plasmonic Properties. ACS Materials Au. 2023. vol. 3. doi: 10.1021/acsmaterialsau.3c00023.

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