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- W1979013059 abstract "Results of the recent application studies of laser-based techniques for conservation practice, carried out in the frames of research and conservation projects are presented and discussed. The Gotland Sandstone Project covers laser cleaning, spectroscopic techniques of the process monitoring and materials analysis. The post-processing effect is investigated by means of LIBS, colorimetry, SEM and XEDS in order to answer questions regarding encrustation removal, discoloration and alteration due to environmental pollution and laser interaction, respectively. The cleaning is monitored acoustically. Slight differences in stone yellowing are revealed when applying laser in air or pure N<sub>2</sub> environment which is ascribed to material oxidation and partial combustion of surface remnants due to presence of O<sub>2</sub> contributing to the final effect of laser cleaning. Results of microscopic observation are supported by the presence of elements S, Al, Ca, and C which prevail in crust. In case of restoration of the historical documents on paper the ablative cleaning and the nearly nondestructive identification and composition analysis of surface layers such as contaminants, substrate and pigments are performed. Spectra obtained by means of the LIPS technique for historical, originally contaminated and also artificially soiled model samples reveal reach structures. The emission lines of Ca, Na, K, Al and Fe are ascribed to contaminants because of intensities decreasing with prolonged surface irradiation during laser cleaning. Bands of Ti and Ba correspond to white pigments (TiO<sub>2</sub> and BaSO<sub>4</sub>) in the paper and are confirmed by the Raman spectra as well. For identification of historical pigments the reference measurements on model substrates are performed, too." @default.
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- W1979013059 date "2007-03-02" @default.
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- W1979013059 title "<title>Laser techniques for cultural heritage research case studies</title>" @default.
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- W1979013059 doi "https://doi.org/10.1117/12.726906" @default.
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