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On-site analysis of archaeological artifacts excavated from the site on the outcrop at Northwest Saqqara, Egypt, by using a newly developed portable fluorescence spectrometer and diffractometer

Abstract

Blue-painted pottery was produced in the New Kingdom, Egypt, and decorated with blue, red, and black pigment. In this study, two newly developed portable instruments, a portable X-ray fluorescence spectrometer and a portable X-ray powder diffractometer, were brought to the site on the outcrop at Northwest Saqqara, an archaeological site in Egypt, to verify their performance in on-site analysis of excavated artifacts at the site. Pigments used for the blue-painted pottery and plasters in the New Kingdom were analyzed by these instruments on the basis of both their chemical compositions and crystal-structural information. The blue pigments were identified as two different pigments, Egyptian blue and cobalt blue. The diffraction pattern of the blue pigment of the painted pottery exhibited that of spinel structure. The XRF spectrum of the blue pigment obtained by the same instrument from the same position indicates the presence of Mn, Co, Fe, Ni, and Zn. The possibility of compositional transitions of the cobalt blue pigment with time was revealed on by detailed analysis of the XRF data. The reason for the transitions is considered together with the archaeological background of the New Kingdom, Egypt.

On site XRF analysis at an archaeological excavation site has revealed that the typological transition of blue-painted pottery excavated from the site on the outcrop at Northwest Saqqara, Egypt was followed by a chemical compositional transion of the pigment.

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Acknowledgements

The Ourstex 100FA-II portable X-ray fluorescence spectrometer was jointly developed with the Ourstex Corporation. We are deeply grateful to Mr Y. Nakajima and Mr H. Nagai. Development and improvement of a portable X-ray powder diffractometer, the X-tec PT-APXRD were jointly carried out by the Institute of X-Ray Technologies Co., Ltd. We would like to express our gratitude to Dr K. Taniguchi, Mr T. Utaka, and S. Maeo.

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Correspondence to Izumi Nakai.

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Abe, Y., Nakai, I., Takahashi, K. et al. On-site analysis of archaeological artifacts excavated from the site on the outcrop at Northwest Saqqara, Egypt, by using a newly developed portable fluorescence spectrometer and diffractometer. Anal Bioanal Chem 395, 1987–1996 (2009). https://doi.org/10.1007/s00216-009-3141-x

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Keywords

  • Archaeometry
  • Portable XRF
  • Portable XRD
  • Cobalt blue
  • On-site analysis