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Proceedings Paper

Laser cleaning experimental investigations on ancient coins
Author(s): E. Drakaki; D. Evgenidou; V. Kantarelou; A. G. Karydas; N. Katsikosta; E. Kontou; A. A. Serafetinides; C. Vlachou-Mogire
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Paper Abstract

Laser cleaning tests were performed on ancient (Roman and Byzantine) coins, which belong to the collection of the Numismatic Museum of Athens, Greece. Coins with various types of surface corrosion were studied, using Q-switched Nd:YAG, CO2 and Er:YAG lasers and a range of laser pulsing parameters on dry and wet surfaces. A section of each object was cleaned mechanically, by the conservators of the museum in order to show the results of this method. It was discovered that the results of laser cleaning was influenced by the type of corrosion of the surface of the coins. X-ray fluorescence was applied as analytical technique. The results show that XRF could provide detail information about the surface chemical nature of the treated objects, as well as about their past and present state and it leaded to recommendations for restoration with the appropriate laser cleaning conditions.

Paper Details

Date Published: 19 December 2008
PDF: 10 pages
Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 702707 (19 December 2008); doi: 10.1117/12.822443
Show Author Affiliations
E. Drakaki, National Technical Univ. of Athens (Greece)
D. Evgenidou, Numismatic Museum of Athens (Greece)
V. Kantarelou, National Ctr. for Scientific Research Demokritos (Greece)
A. G. Karydas, National Ctr. for Scientific Research Demokritos (Greece)
N. Katsikosta, Numismatic Museum of Athens (Greece)
E. Kontou, Numismatic Museum of Athens (Greece)
A. A. Serafetinides, National Technical Univ. of Athens (Greece)
C. Vlachou-Mogire, Numismatic Museum of Athens (Greece)


Published in SPIE Proceedings Vol. 7027:
15th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Elena Taskova; Ekaterina Borisova; Alexander Serafetinides, Editor(s)

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