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Microchimica Acta

, Volume 168, Issue 3–4, pp 283–291 | Cite as

Identification of ancient gilding technology and Late Bronze Age metallurgy by EDXRF, Micro-EDXRF, SEM-EDS and metallographic techniques

  • Elin Figueiredo
  • Rui J. C. Silva
  • M. Fátima Araújo
  • João C. Senna-Martinez
Original Paper

Abstract

A combination of analytical techniques capable of elemental and microstructural characterisation was used for the identification of ancient gilding technology and bronze metallurgy. EDXRF, micro-EDXRF, SEM-EDS analysis and metallographic examinations were applied in the study of artefacts dating to the end of the second millennium BC from Crasto de São Romão in Central Portugal. Results report to the finding of an exceptional gilded copper nail among bronze artefacts with 9 wt.% to15 wt.% tin and minute other metallic impurities. Additionally, analysis of a crucible fragment points out for bronze production at the archaeological site. EDXRF and micro-EDXRF analysis made on the copper nail showed that it was gilded only on the front side of the head, and that the gold layer has been lost in the most exposed areas. SEM-EDS analysis showed that the gold layer has 5–8 µm in thickness and is covered with a thick corrosion layer. The gilding technique is discussed based on the gold layer composition and gold/copper substrate interface. So far, this object seems to be the first diffusion gilded artefact identified in the Portuguese territory dated to Late Bronze Age.

Keywords

Archaeometry EDXRF SEM-EDS Gold Copper Bronze 

Notes

Acknowledgments

This work has been carried out in the framework of the project METABRONZE (Metallurgy and Society in Central Portugal Late Bronze Age, POCTI/HAR/58678/2004) financed by the Portuguese Science Foundation (FCT). E.F. acknowledges the FCT for the SFRH/BD/27358/2006 grant and is thankful to Cristiana Nunes for her valuable comments and suggestions to an early version of the manuscript.

Supplementary material

604_2009_284_MOESM1_ESM.doc (610 kb)
Electronic Supplementary Material 1 (DOC 610 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Elin Figueiredo
    • 1
    • 2
    • 3
  • Rui J. C. Silva
    • 2
  • M. Fátima Araújo
    • 1
  • João C. Senna-Martinez
    • 4
  1. 1.Química Analítica e Ambiental, Instituto Tecnológico e NuclearEstrada Nacional 10SacavémPortugal
  2. 2.CENIMAT / I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e TecnologiaUniversidade Nova de LisboaCaparicaPortugal
  3. 3.Departamento de Conservação e Restauro, Faculdade de Ciências e TecnologiaUniversidade Nova de LisboaCaparicaPortugal
  4. 4.Centro de Arqueologia (Uniarq), Faculdade de LetrasUniversidade de LisboaLisbonPortugal

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