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Título
UV laser removal of varnish on tempera paints with nanosecond and femtosecond pulses
Autor(es)
Materia
Ablation
Femtosecond lasers
Nanosecond lasers
Artworks
Laser cleaning
Cultural heritage
Clasificación UNESCO
2209.10 Láseres
2209.14 Propiedades ópticas de los sólidos
Fecha de publicación
2011-01-04
Editor
Royal Society of Chemistry
Citación
Phys. Chem. Chem. Phys. 13, 4625-4631
Resumen
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.
URI
ISSN
1463-9076
Colecciones
- ALF. Artículos [297]