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A multimodal study of smalt preservation and degradation on the painting “Woman doing a Libation or Artemisia” from an anonymous painter of the Fontainebleau School

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Abstract

The blue pigment smalt, a synthetic potash glass tinted with cobalt, was widely used between the sixteenth and the eighteenth centuries. As part of a study on the alteration of smalt and the reconstitution of its original color, the painting: Woman doing a Libation or Artemisia (Fontainebleau school, 1570) was examined in which the artist used smalt as a blue pigment, which is now degraded. Noninvasive imaging was performed using macro-2D X-ray fluorescence and reflectance imaging spectroscopy to get an overview of the artist’s palette and its distribution. Samples prepared as cross sections were also analyzed by scanning electron microscopy coupled with energy dispersive spectroscopy, micro-X-ray absorption near-edge structure spectroscopy and synchrotron micro-X-ray diffraction imaging to determine the preservation state of the smalt as well as structural information on other pigments adjacent to smalt grains in individual paint layers, which could play a role in the degradation process. On the one hand, the study conducted on the alteration of smalt has shown that it is very weathered and mixed with hydrocerussite, which could be a factor that would facilitate the alteration. On the other hand, these analyses have made it possible to identify and locate the pigments used, which will be the basis for the virtual reconstruction of the color of the painting.

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Data Availability Statement

This manuscript has associated data in a data repository of the ESRF. The 2D-\(\upmu\)XRD datasets generated during and analyzed during the current study are available in the ESRF repository: DOI 10.15151/ESRF-ES-527799901. All the other datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the University School of Humanities, Creation, Heritage, Investment of Future ANR-17- EURE-0021 - Fondation des Sciences du Patrimoine through the MARCS project. We would like to thank the SOLEIL synchrotron facility for providing beamtime through the in house proposal 99200118 as well as Sebastian Schoeder and Laurent Tranchant for the help during beamtime at the PUMA beamline. We would also like to thank the European Synchrotron Research Facility (ESRF) for providing beamtime through the Historical Materials BAG (HG172) as well as Manfred Burghammer for the help brought for the use of the beamline ID13 and Marine Cotte, Victor Gonzales, Frederik Vanmeert and Letizia Monico, responsible scientists of the Historical Materials BAG for their support of the programme. Finally, we thank Cécile Scallierez, curator at the Louvre museum and Isabelle Chochod, restorer of the painting, for allowing us study the artwork together and for the fruitful discussions.

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Correspondence to Ina Reiche.

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Focus Point on Scientific Research in Cultural Heritage 2022 Guest editors: L. Bellot-Gurlet, D. Bersani, A.-S. Le Hô, D. Neff, L. Robinet, A. Tournié.

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de Mecquenem, C., Eveno, M., Alfeld, M. et al. A multimodal study of smalt preservation and degradation on the painting “Woman doing a Libation or Artemisia” from an anonymous painter of the Fontainebleau School. Eur. Phys. J. Plus 138, 185 (2023). https://doi.org/10.1140/epjp/s13360-023-03799-4

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