Preliminary Results of the Er:YAG Laser Cleaning of Mural Paintings

Andreotti, Alessia; Colombini, Maria Perla; Felici, Anna Candida; deCruz, A.; Lanterna, Giancarlo; Lanfranchi, M.; Nakahara, K.; Penaglia, F.

doi:10.1007/978-3-540-72310-7_24

Cited by 2 publications

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“…In order to evaluate the temperature increase, a 1-mm fragment was sampled using a scalpel from an area close to the frame, and glued onto the thermocouple and inserted into the nylon box. In order to perform a safe removal of patina and old varnishes, precedent studies have highlighted the importance of a progressive cleaning by applying subsequent laser applications at low fluences, rather than of a single laser pulse at higher one [3,5,17,21].…”

Section: Panel Paintingmentioning

confidence: 99%

“…The Er:YAG laser was introduced as an alternative to traditional methods for cleaning easel and mural paintings [4,[15][16][17][18], paper and parchment [19], and different crust types from stones [20]. The compounds commonly present on the surfaces of art objects have absorption bands in mid-infrared and near ultraviolet, which lead to vibrational and electronic excitations, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Laser cleaning of works of art: evaluation of the thermal stress induced by Er:YAG laser

et al. 2014

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The Er:YAG laser has proven particularly efficient in cleaning procedures of works of art. The removal of the superficial deposits is achieved through melting, thermal decomposition and evaporation. However, the energy absorbed by vibrational modes is dissipated as heat, increasing the temperature of the surface coating that could cause damage on the object. The aim of this study was to evaluate the temperature increase induced by a Er:YAG MonaLaser (LLC., Orlando, FL, USA). To that purpose, we designed a dedicated device to perform the tests in an inert atmosphere or with a wetting agent, to measure the radiant energy per laser pulse. Tests were carried out both on graphite, which absorbs IR radiation and showed a very intense flash emission, and on different kind of samples representative of materials with different levels of conductivity and thermal diffusivity. Results obtained showed that the temperature increase in the irradiated surface depends on the substrate but never causes the damage of the organic and inorganic material. The use of a solvent as wetting agent has been also tested

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Section: Panel Paintingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser cleaning of works of art: evaluation of the thermal stress induced by Er:YAG laser

et al. 2014

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“…The use of Nd:YAG lasers with variable pulse duration is well established, especially in field of stone and metal cleaning (Siano & Salimbeni, 2010). On the other hand, pioneering studies have been performed in the mural painting cleaning (Shekede, 1997;Gaetani & Santamaria, 2000;Andreotti et al, 2006Andreotti et al, , 2007Striova et al, 2011) but their application in real case studies is limited (Siano et al, 2007). In this respect, further phenomenological studies are of the utmost importance.…”

Section: Introductionmentioning

confidence: 99%

Optical and spectroscopic tools for evaluating Er:YAG laser removal of shellac varnish

Striová

Salvadori

Fontana

et al. 2015

Studies in Conservation

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We report on tests to remove naturally and artificially aged shellac varnish by laser and traditional chemical cleaning from the substrates of mural paintings. Optical tools were used for the evaluation of cleaning processes, in particular laser microprofilometry to assess the changes in the surface morphology and time-domain confocal optical coherence tomography (OCT) to evaluate varnish thickness. The cleaning assessment was integrated with molecular characterization provided by portable Fourier transform infrared spectroscopy operating in reflectance mode, and colorimetric measurements. This complete analytical approach led to optimized laser-based cleaning tests at 1.9 and 2.6 J/cm 2 in the presence of isopropanol, which ensured controllable and safe partial removal of shellac varnish without alteration to the substrate morphology.

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Preliminary Results of the Er:YAG Laser Cleaning of Mural Paintings

Cited by 2 publications

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Laser cleaning of works of art: evaluation of the thermal stress induced by Er:YAG laser

Laser cleaning of works of art: evaluation of the thermal stress induced by Er:YAG laser

Optical and spectroscopic tools for evaluating Er:YAG laser removal of shellac varnish

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