Removal of graffiti paintings from the Mansion de Mattis site in Corato (Bari), Italy: Laser deveiling or complete cleaning?

G. Daurelio; E. S. Andriani; A. Albanese; I. M. Catalano; G. Teseo; D. Marano

doi:10.1117/12.816822

21 April 2009 Removal of graffiti paintings from the Mansion de Mattis site in Corato (Bari), Italy: Laser deveiling or complete cleaning?

G. Daurelio, E. S. Andriani, A. Albanese, I. M. Catalano, G. Teseo, D. Marano

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Proceedings Volume 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 713129 (2009) https://doi.org/10.1117/12.816822
Event: XVII International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2008, Lisboa, Portugal

Abstract

Nowadays one the main problem of stone monuments conservation is not only the natural environment deterioration but the defaced, in particular esthetic, due to graffiti. This paper presents the different stages of the cleaning graffiti research: the laboratory study phase, in which the aims were to investigate the laser cleaning effect on substrate and testing user-friendly and efficient solutions for in situ application; the application phase in which the study results were applied in the restoration of Palazzo de Mattis facade. The graffiti cleaning were carried out by using a Q-Switch Nd:YAG laser source (λ=1064 nm with pulse duration, t=8 ns, f=2 to 20 Hz, energy per impulse up to 280 mJ) in dry, wet and Very wet modes adopting the Daurelio technique n.1 (blade spot laser). The Q-Switch Nd:Yag laser source has demonstrated to be the most suitable for a fully or, according to new restoring theory, "de veiling" graffiti ablation.

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G. Daurelio, E. S. Andriani, A. Albanese, I. M. Catalano, G. Teseo, and D. Marano "Removal of graffiti paintings from the Mansion de Mattis site in Corato (Bari), Italy: Laser deveiling or complete cleaning?", Proc. SPIE 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 713129 (21 April 2009); https://doi.org/10.1117/12.816822

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KEYWORDS

Q switched lasers

Q switching

Laser ablation

Nd:YAG lasers

Pulsed laser operation

Beam shaping

Colorimetry

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