Contribution of new multi-technical methodologies in the study and conservation of numismatic heritage of underwater origin
Abstract
his paper presents a study of the conservation status of copper-based coins from the National Museum of Underwater Archaeology. The multitechnical methodology includes conventional instrumentation such as optical microscopy, FTIR spectroscopy and advanced non-invasive techniques such as microparticle voltamperometry and focused ion beam -FESEM-EDX. Thus it has been possible to identify the type of alloy, corrosion products, surface deposits and old interventions. It should be noted the identification of atypical alteration mechanisms such as the formation of carboxylated complexes of metal ions generated in the electrochemical processes of corrosion of the metal or alloy and the lipid materials fixed on the surface of the coin when it was in circulation and that, due to its hydrophobic character have been preserved in the underwater environment in which the coins have remained for centuries. These findings have been very useful to establish the most suitable conservation treatments for these pieces.
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References
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