This article presents and investigation the diffused reflection spectra of light from designed green pigments based on chromium(III) oxide, obtained by pyrochemical method by thermal decomposition of ammonium dichromate powder and hydrolytic method from chromium(III) sulfate in water-ammonia solution, as well as zinc oxide doped with cobalt, which are obtained by pyrochemical Sol-gel citrate method, with different levels of cobalt doping, obtained on the basis of silicone with the addition of obtained green pigments based on chromium(III) oxide), some commercial samples of PLA plastics are green in color and from naturally aging green leaves of grasses, trees and shrubs typical of areas with a transitional climate from mild continental to subtropical according to the Köppen classification. A comparative analysis of their diffuse light reflection spectra was performed to determine whether it is possible to partially simulate the diffused light reflection spectra from naturally aging green tree leaves with non-organic pigments or functional materials. Based on the analysis conducted, it is concluded that the studied commercial samples of green PLA plastics are categorically not suitable for simulating the spectra of diffused light reflection from green leaves. However, it is possible to create functional composite materials that can approximately imitate the spectra of diffused light reflection from green leaves of grasses, trees and bushes.

Keywords: spectroscopy, diffuse reflection, functional materials, pyrochemical sol-gel citrate method, hydrolytic methods, chromium (III) oxides, inorganic pigments