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Oujja, Mohamed García, Ana Romero Vázquez, Carolina Vázquez de Aldana, Javier R. Moreno Pedraz, Pablo Manuel Castillejo, Marta 2014-06-26T07:33:57Z 2014-06-26T07:33:57Z 2011-01-04 Phys. Chem. Chem. Phys. 13, 4625-4631 1463-9076 http://hdl.handle.net/10366/123361 Two laser cleaning approaches based on ablation by ultraviolet laser pulses of femtosecond (fs) and nanosecond (ns) durations for the removal of shellac varnish from egg-yolk based tempera paints are investigated. Laser irradiation effects, induced on the varnish layer and on the underlying temperas by multiple pulses in the fs domain at 398 and 265 nm and single pulses in the ns domain at 213 nm, were examined following a spectroanalytical approach. By using optical microscopy, colorimetry and laser induced fluorescence it was found that irradiation of the varnished temperas with fs pulses changes the texture of the varnish surface and results in degradation of the underlying coloured paint. In contrast, operating with pulses of 15 ns at the highly absorbed wavelength of 213 nm, controlled micrometric layer removal of the varnish is possible without noticeable modification of the coloured temperas. These results widen the choice of laser conditions for painting restoration. application/pdf eng Royal Society of Chemistry Attribution-NonCommercial-NoDerivs 3.0 Unported https://creativecommons.org/licenses/by-nc-nd/3.0/ info:eu-repo/semantics/openAccess Ablation Femtosecond lasers Nanosecond lasers Artworks Laser cleaning Cultural heritage 2209.10 Láseres 2209.14 Propiedades ópticas de los sólidos UV laser removal of varnish on tempera paints with nanosecond and femtosecond pulses info:eu-repo/semantics/article