Journal
APPLIED SURFACE SCIENCE
Volume 387, Issue -, Pages 118-127Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.06.017
Keywords
Laser cleaning; Silver; Sterling silver; Tarnishing; Cultural heritage
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Funding
- project CREMEL [HAR2011-22402]
- Spanish Ministry of Economy and Competitiveness (MINECO) [BES-2012-052716]
- Community of Madrid [S2013/MIT_2914]
- EU project Integrated Platform for the European Research Infrastructure on Cultural Heritage (IPERION-CH) [H2020-INFRAIA-2014-2015, 654028]
- Spanish Network on Science and Technology for the Conservation of Cultural Heritage (TechnoHeritage)
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In this study we evaluate the laser cleaning of tarnished pure and sterling silver substrates using a nanosecond Q-switched Nd:YAG laser at 1064, 532 and 266 nm. To assess the effects associated with cyclic laser cleaning treatments, several cycles of tarnishing followed by laser cleaning were applied on silver coupons that were characterized by gravimetry, colorimetry, scanning electron microscopy, X-ray photoelectron spectroscopy and micro-Raman spectroscopy. According to the obtained results, none of the three wavelengths is recommended for laser cleaning of pure silver objects, while for sterling silver artifacts, the visible laser wavelength of 532 nm seems the most appropriate. (C) 2016 Elsevier B.V. All rights reserved.
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