Laser paint removal on the outside walls of the Church Abbey Saint Adoeno in Bisceglie (BAT), Italy: a case study

G. Daurelio; I. M. Catalano; P. Bassi

doi:10.1117/12.879897

16 November 2010 Laser paint removal on the outside walls of the Church Abbey Saint Adoeno in Bisceglie (BAT), Italy: a case study

G. Daurelio, I. M. Catalano, P. Bassi

Author Affiliations +

Proceedings Volume 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 77511S (2010) https://doi.org/10.1117/12.879897
Event: 18th International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2010, Sofia, Bulgaria

Abstract

It is the oldest church in the city after the cathedral. It is among the purest examples of Romanesque. It was founded in 1074 and expenses for its construction helped the inhabitants of the agricultural hamlets of the Cirignano, Pacciano and Zappino. The church was dedicated to St. Adoeno Dado, bishop of Rouen, protector of Norman, because , according to tradition, the building also participated Norman soldiers. San Adoeno church has a façade at cusp with a truncated tympanum , crowned by an eagle. In the centre of the façade there is a rose ornament surrounded by four lions and a statue of St. Adoeno ( Figs. A to I ). On the outside walls of this Abbey many graffiti, produced by different coloured spray paints were found. After the usual photographical tests some Laser Paint Removal trials were executed to verify the damage threshold of the calcareous stony substrate as well as the possibility to ablate these paints by a Nd - YAG laser in Q-Switch mode. Even if all the classical four laser paint ablation techniques were employed some paints showed a great difficulty to be removed from the substrate. For these ones it was necessary to increase at maximum both the energy per pulse and the fluence value for obtaining some acceptable result but the substrate looked turned pale. It was decided to remove a small amount of these paints and subject to chemical analysis for determining whether they were acrylic based. At the same time it was investigated on the type of limestone substrate that appeared more porous and less hard on the surface than the common local limestone marble basin, that is, Trani or Bisceglie. So, on the light of these investigations, the possible solution for this hard laser ablation problem was carried out with an acceptable final result.

Citation Download Citation

G. Daurelio, I. M. Catalano, and P. Bassi "Laser paint removal on the outside walls of the Church Abbey Saint Adoeno in Bisceglie (BAT), Italy: a case study", Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 77511S (16 November 2010); https://doi.org/10.1117/12.879897

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KEYWORDS

Laser ablation

Laser systems engineering

Laser damage threshold

Laser processing

Photography

Antireflective coatings

Borosilicate glass

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