Abstract
The study of varnishes from musical instruments presents the difficulty of analysing very thin layers of heterogeneous materials on samples most of which are generally brittle and difficult to prepare. Such study is crucial to the understanding of historical musical instrument varnishing practices since written sources before 1800 are very rare and not precise. Fourier-transform infrared (FTIR) spectroscopy and imaging methods were applied to identify the major chemical components within the build-up of the varnish layers on a cello made by one of the most prominent French violin-makers of the eighteenth century (Jacques Boquay, ca. 1680–1730). Two types of FTIR imaging methods were used: scanning with a synchrotron-based microscope and full-field imaging using a 2D imager with a conventional source. An interpretation of the results obtained from these studies on the Boquay cello is that the maker first applied a proteinaceous layer, probably gelatine-based animal glue. He later applied a second layer based on a mixture of a drying oil and diterpenic resin from Pinaceae sp. From an historical perspective, the results complement previous studies by describing a second technique used for musical instrument finishes at the beginning of the eighteenth century in Europe.
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Acknowledgements
We thank D. Jaillard (CCME, Orsay) and M.-A. Languille (IPANEMA, SOLEIL) for sample ultra-microtomy, A. von Bohlen for SEM/EDX (ISAS, Dortmund), C. Egasse and S. Thao-Heu (CRCC, Paris) for performing chromatographic analyses, E. Quirico (LPG, UMR5109 CNRS, Grenoble) for full-field FTIR imaging analyses, P. Dumas (SMIS beamline, SOLEIL) and P. Cook (IPANEMA, SOLEIL) for their critical reading of the manuscript and M.-A. Tordeux (SOLEIL) for interesting discussions on the stability of the SOLEIL source. Specific additional funding was provided by Cité de la musique, the SOLEIL synchrotron and the French Ministry of Culture.
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Published in the special issue Analytical Chemistry for Cultural Heritage with Guest Editors Rocco Mazzeo, Silvia Prati, and Aldo Roda.
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Bertrand, L., Robinet, L., Cohen, S.X. et al. Identification of the finishing technique of an early eighteenth century musical instrument using FTIR spectromicroscopy. Anal Bioanal Chem 399, 3025–3032 (2011). https://doi.org/10.1007/s00216-010-4288-1
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DOI: https://doi.org/10.1007/s00216-010-4288-1