Assessment of the state of conservation of stone artworks after laser cleaning: comparison with conventional cleaning results on a two-decade follow up |
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| Authors: | Renzo Salimbeni Roberto Pini Salvatore Siano Giancarlo Calcagno |
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| Institution: | a Istituto di Elettronica Quantistica-CNR, via Panciatichi 56/30, 50127 Florence, Italy;b ALTECH srl, Vicolo Ugo Foscolo 6, 52112 Padua, Italy |
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| Abstract: | The utilization of laser light to produce fine and selective cleaning of superficial deposits and encrustation from stones was originally proposed more than 20 years ago by John Asmus who performed pioneering trials of laser cleaning on stone façades in Venice, Cremona and Padua. The opportunity to collect stone samples from these sites allowed us to carry out an original study aimed at evaluating the conservation state of stone surfaces cleaned 10–20 years ago by means of three different techniques: Nd:YAG laser radiation, micron sandblasting and chemical pads. Samples of various stone types, as Istria limestone, Botticino limestone and Nanto sandstone were collected and examined by means of optical and SEM microscopy, FT/IR, and EDAX analyses. The results provided preliminary indications that the state of conservation of stone surfaces previously subjected to laser cleaning is generally better in comparison with those which concurrently underwent mechanical and chemical cleaning. |
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| Keywords: | laser cleaning stone cleaning restoration black crust Nd:YAG laser |
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