Collection were studied at the Centre for Archaeometry with Laboratory for Conservation and Restoration (CALCR) with X-ray fluorescence spectrometer (XRF), supplemented by Raman spectroscopy. The paintings were pre-examined under a microscope, UV, IR source, spectrophotometer and a colour analyser at the laboratory in the Institute of Ethnology and Folklore Studies with Ethnographic Museum (IEFSEM BAS) according a contract between the institute and the owner for an authentication of the collection.