According to traditional Baroque recipes malachite paint layers were prepared, using different binders and finishing protective layers. Easel (model) paintings were then exposed to different environmental influences, such as UV-Vis radiation and humidity and temperature oscillations. Utilizing Raman microscopy, paint layers of aged and non-aged samples were investigated, where paint layers of malachite prepared in egg yolk tempera showed lower stability than the one prepared in oil media. Besides green particles of malachite, the black particles were also noticed in the cross-sections of all the samples, although the higher proportion was detected in the old ones. Using Raman microscopy , the presence of a copper oxide was confirmed, most likely as a consequence of the deterioration process in the malachite paint layers. It`s presence was confirmed using thermo gravimetric analysis (TG) and X-ray powder diffraction analysis (XRD). This research was presented at 7th International Congress on the Application of Raman Spectroscopy in Art and Archaeology.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 512971307According to traditional Baroque recipes easel (model) paintings were prepared containing different paint layers and exposed to different environmental influences. Physical and chemical properties of different paint layers were examined, which occur under variations of UV-Vis radiation, pollution, and exposure to humidity and temperature oscillations. Utilizing Raman microscopy, degradation products of lead white, prepared in oil media and unfatty egg tempera, after UV-Vis exposure were determined. Degradation products of azurite, prepared in oil media after the exposure to temperature and relative humidity oscillations were also identified, as well as changes in the composition of cinnabar, prepared in linseed oil, after exposure to pollutants. This research was presented at 7th International Congress on the Application of Raman Spectroscopy in Art and Archaeology.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 512971563The procedure for Surface enhanced Raman spectroscopy in cultural heritage investigations was improved by proposing a new SERS substrate. Described research focused on the synthesis of a stable and reproducible substrate of high viscosity. A new UV-photoreduced Ag substrate using hydroxyproply cellulose as stabilising agent was developed and employed for detection and identification of organic colorants. SERS-activity was tested with alizarin as a reference dye and compared among known substrate (Lee-Meisel colloid). Substrate enabled the detection of organic colorants in colour layers without sample pre-treatment. Such substrate can also be used in the cultural heritage field for investigation of sample cross sections as it is possible to exert a better control of the application of the substrate and focus the analysis to a layer of interest. The research was presented at International Congress RAA2013.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 512972075