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Analytical and Bioanalytical Chemistry

, Volume 392, Issue 4, pp 755–763 | Cite as

Multianalytical approach to the analysis of English polychromed alabaster sculptures: μRaman, μEDXRF, and FTIR spectroscopies

  • Kepa CastroEmail author
  • Alfredo Sarmiento
  • Maite Maguregui
  • Irantzu Martínez-Arkarazo
  • Nestor Etxebarria
  • Manuel Angulo
  • María Urrutikoetxea Barrutia
  • Juan Manuel González-Cembellín
  • Juan Manuel Madariaga
Original Paper

Abstract

A complete study of several English polychromed alabaster sculptures is presented. The support, pigment, and binders were characterised by combining μEDXRF, μRaman, and FTIR spectroscopies. Among the pigments, minium, vermilion, lead white, carbon black, red iron oxide, and a degraded green copper pigment were determined, together with gold leaf. The presence of the rare mineral moolooite (copper oxalate) was also found as a degradation product in the green areas, where weddellite (calcium oxalate dihydrate) was also determined. These facts, together with degradation of the green copper pigment, suggest microbiological degradation of the original materials. Remains of glue and a varnish were also determined by FTIR spectroscopy and principal-components analysis (PCA) of the spectra. Finally, PCA analysis was carried out to confirm whether the pieces came from the same quarry.

Keywords

Pigment Alabaster Raman XRF Artwork Sculpture 

Notes

Acknowledgements

A. Sarmiento is grateful to the Spanish Ministry of Education and Science for his FPU fellowship. M. Maguregui is grateful to the UPV/EHU for her fellowship. This work was partially funded by Universidad-Empresa Project PIETRA (ref. UE05-A09). The authors want to thank Museo Diocesano y Arte Sacro de Bilbao for all their support.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Kepa Castro
    • 1
    Email author
  • Alfredo Sarmiento
    • 1
  • Maite Maguregui
    • 1
  • Irantzu Martínez-Arkarazo
    • 1
  • Nestor Etxebarria
    • 1
  • Manuel Angulo
    • 1
  • María Urrutikoetxea Barrutia
    • 2
  • Juan Manuel González-Cembellín
    • 2
  • Juan Manuel Madariaga
    • 1
  1. 1.Department of Analytical ChemistryUniversity of the Basque CountryBilbaoSpain
  2. 2.Museo Diocesano de Arte SacroBilbaoSpain

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