The Finishing Technique of the Stone Monuments of Persepolis: Further Studies and New Findings Through the Use of Non‐Destructive Analytical Techniques. (17th September 2018)

• Record Type: Journal Article
• Authors: Ridolfi, S.; Laurenzi Tabasso, M.; Askari Chaverdi, A.; Callieri, P.
• Is Part Of: Archaeometry. Volume 61:Number 2(2019)
• Page Start: 272
• Page End: 281
• Publication Date: 2018-09-17
• Subjects: Persepolis -- stone finishing -- bone white -- fluorapatite -- XRF spectrometry -- PCA analysis; Archaeometry -- Periodicals; Archaeology -- Expertising -- Periodicals; 930.1
• DOI: 10.1111/arcm.12417
• Languages: English
• ISSNs: 0003-813X

Abstract

Abstract : The studies on the finishing technique of the stone monuments in Persepolis (Iran) are part of the archaeological project jointly launched in 2008 by Iran and Italy, named 'From Palace to Town'. The first experimental results, obtained on a very limited number of samples, revealed that the Achaemenid builders and sculptors used a white pigment, a kind of bone white, calcium fluorapatite, obtained by burning animal bones, to hide the dark grey colour of the stone. In order to verify these unexpected results, a new campaign was implemented to analyse a much larger number of samples. XRF spectrometry, a non‐destructive technique, was used and the experimental results were further elaborated by PCA. The presence of a white superficial layer was confirmed, and the use of fluorapatite was confirmed as well, but only on monuments attributed to the Xerxes period or later, while in the earlier monuments the white layer was obtained using gypsum.