The Archaeological Site of Persepolis (Iran): Study of the Finishing Technique of the Bas-Reliefs and Architectural Surfaces

Research at Persepolis reveals that the dark grey limestone used in its imperial monuments was intentionally covered with a thin, whitish layer containing fluorapatite and calcite. This layer likely originated from calcined animal bones, with slaked lime serving as a binder. The discovery of a kiln with calcined bone remains and a waste pit further supports this finding. Additionally, a second white layer, possibly barium sulphate, was found beneath surface encrustation, suggesting remnants of a polychrome finishing. The study, part of the 'From Palace to Town' project, involved petrographic analysis, decay assessment, and conservation treatment testing.

Askari Chaverdi, A., Callieri, P., Laurenzi Tabasso, M., & Lazzarini, L. (2015). The Archaeological Site of Persepolis (Iran): Study of the Finishing Technique of the Bas-Reliefs and Architectural Surfaces. Archaeometry, 58(1), 17–34. Portico. https://doi.org/10.1111/arcm.12153