Abstract
Laser-induced chemical modifications of various types of contemporary and ancient parchments have been studied. Such research in physico-chemical diagnostics is the prerequisite of computer-aided laser destructionless processing based on off-line and on-line diagnostics. The photometric determination of the water-soluble degradation products of collagen proved to be a sensitive method to detect laser-induced alterations of parchment even below the ablation threshold fluence. It is indicative for changes on the molecular level. The shrinking temperature measurement by the micro-hot-table technique turned out to be sensitive only to laser treatment that caused photochemical reactions (i.e. UV, 308 nm). At the visible (532 nm) and the infrared wavelengths (1064 nm), photochemical alterations are absent, solely thermally induced crosslinking of the collagen fibres is observed. Scanning electron microscopy proved only sensitive to phase changes like melting accompanying ablation above the threshold fluence.
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Puchinger, L., Pentzien, S., Koter, R., Kautek, W. (2005). Chemistry of Parchment-Laser Interaction. In: Dickmann, K., Fotakis, C., Asmus, J.F. (eds) Lasers in the Conservation of Artworks. Springer Proceedings in Physics, vol 100. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-27176-7_7
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DOI: https://doi.org/10.1007/3-540-27176-7_7
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