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The main focus of the research presented in this paper was the investigation of the effect of LED-lighting on some art paint colours by reproducing indoor museum conditions applied on art materials. A series of inorganic pigments and organic binders were selected and mixed in different ratio for obtaining 2-components paint mock-ups thus as much as possible allowing to reproduce the paint colours used in modern and contemporary art. Three different systems were employed for light exposure of the prepared samples with different content between 410 nm and 490 nm. To analyse colour changes of the pigments, spectrophotometry was adopted. Chemical stability of the materials was investigated using Pyrolysis Gas Chromatography / Mass Spectrometry (Py-GC/MS), also in Thermally assisted Hydrolysis and Methylation mode (THM-GC/MS), and Fourier Transform Infrared Spectroscopy in Attenuated Total Reflection (FTIR-ATR) mode. Additionally, μ-Raman spectroscopy was used.

EXPERIMENTAL STUDY ON CHEMICAL AND COLORIMETRIC CHANGES OF ART MATERIALS BY LED IRRADIATION