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Archaeological and Anthropological Sciences

, Volume 11, Issue 12, pp 6551–6567 | Cite as

Phosphatic alteration of lead-rich glazes during two centuries of burial: Bartlam, Bonnin & Morris, and Chelsea porcelain

  • J. Victor OwenEmail author
  • Jacob J. Hanley
  • Joeseph A. Petrus
Original Paper
  • 40 Downloads

Abstract

Discolored lead-rich glazes on phosphatic porcelain sherds from the sites of the Bartlam (Cain Hoy, SC), Bonnin & Morris (Philadelphia, PA), and Chelsea (London, UK) factory sites record the effects of alteration after two centuries of burial. The alteration presents as a dark brown to black scale on the American samples, and as pale brown crazing of the Chelsea glaze. Backscattered electron images of this material show the development of Liesegang rings and a sharp corrosion boundary where in contact with (relatively) unaltered glaze material. Compared with their unaltered counterparts, the altered glazes are variably but in some instances massively (≥ 90%) depleted in SiO2 and alkalis, and enriched in P2O5, CaO, PbO, and various trace elements, notably V. Some of the Bonnin & Morris samples have had bone ash components—especially CaO—leached from the now-porous phosphatic paste, so their CaO/P2O5 (molecular proportions) ratios (~ 2) are much lower than those of the relatively unaltered Bonnin & Morris samples (3.1–3.5). The ceramic body is not, however, the source of phosphate (and calcium) enriched in the altered glazes because phosphate enrichment characterizes glaze alteration even when there is no evidence of bone ash dissolution. Anthropogenic sources are likely for this and other components enriched in the altered glazes. Glaze alteration is interpreted in terms of leaching (de-alkalization) and silica-network dissolution in the presence of subsurface alkaline aqueous fluids (pH ≥ 9). Unaltered glazes on both creamware and phosphatic porcelain sherds from Cain Hoy have overlapping trace element concentrations, supporting the hypothesis that John Bartlam manufactured porcelain there, despite the apparent absence of biscuit wasters at this site.

Keywords

Porcelain Creamware Alteration Glaze 18th century 

Notes

Acknowledgments

We thank Hilary Young and the Victoria Albert Museum for making available the Chelsea sherds and Nick Panes for providing the Bartlam samples. The “PMA” Bonnin & Morris sherds were made available courtesy of the Philadelphia Museum of Art. We thank Alexandra Kirtley for facilitating loan of this material. The “IND” Bonnin & Morris sherds are from Independence National Historical Park and were made available by Deborah Miller. The manuscript benefitted from comments by two anonymous Journal referees.

Funding information

This study was supported by American Ceramic Circle and Faculty of Graduate Studies and Research Grant (SMU) grants to JVO, and grants from the Canadian Foundation for Innovation and the Nova Scotia Research and Innovation Trust to JH.

Supplementary material

12520_2019_922_MOESM1_ESM.xlsx (10 kb)
ESM 1 (XLSX 10 kb).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of GeologySaint Mary’s UniversityHalifaxCanada
  2. 2.Harquail School of Earth SciencesLaurentian UniversitySudburyCanada

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