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ABSTRACT
The chemical modifications linked to smalt discoloration in historic paintings have been analyzed by the X-ray absorption spectroscopy using synchrotron radiation. The micronic size of the X-ray beam and the wide range of energy provided by the LUCIA beam lines and DiffAds of the SOLEIL synchrotron have been determining in order to prove individually the smalt grains in microsamples from paintings from the National Gallery (London) and the musée du Louvre (Paris) collections. The XANES and EXAFS spectra registered at the threshold K of the coloring cobalt ion have proved that this change in color was associated with the coordination change in the cation.
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Read the articleAUTHORS
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Laurianne ROBINET: Research engineer on the IPANEMA platform at the SOLEIL synchrotron - (currently a research engineer for the French Ministry of Culture at the Centre de Recherche sur la Conservation des Collections (CRCC), USR 3224 CNRS, Museum national d'histoire naturelle)
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Nicolas TRCERA: Scientist on the LUCIA line at the SOLEIL synchrotron
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Sandrine PAGÈS-CAMAGNA: Research engineer for the French Ministry of Culture at the Centre de Recherche et de Restauration des Musées de France (C2RMF)
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Marika SPRING: Scientist at the National Gallery in London
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Solenn REGUER: Scientist on the DiffAbs line at the SOLEIL synchrotron
INTRODUCTION
Field: Synchrotron analysis technology
Degree of technology diffusion: Emergence | Growth | Maturity
Technologies involved: X-ray absorption spectroscopy
Applications: Chemical analysis of heritage works
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Analysis of color loss in smalt paints by X-ray absorption spectroscopy
Context
Bibliography
Websites
SOLEIL Synchrotron http://www.synchrotron-soleil.fr
Software tools
Athena software, Newville M., IFEFFIT: interactive XAFS and FEFF fitting, J. Synchrotron Rad. 8, 322, 2001.
Cherokee software http://www.icmpe.cnrs.fr/spip.php?article578
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