Twenty-six tesserae (red, orange, yellow, light amber, green, blue and white) from the balneum of the villa at Faragola (Ascoli Satriano, Foggia) have been examined by colorimetry, ICPMS, ICPOES and SEMEDS. Different types of calcareous sands have been used as the source of silica (network former), also providing the stabilizing agent. A natron-type soda source served as the network modifier; however, the use of a sodium-rich plant ash and the recycling process have been hypothesized for the production of two tesserae (FT 1 red and FT 3 orange). The colouring and opacifying agents were Cu oxide (cuprite, orange), metallic copper (red), Pb antimonates (yellow), Ca antimonates (white), a mixture of copper (Cu2+) and Pb antimonates (green), a mixture of cobalt (Co2+) or copper (Cu2+) and Ca antimonates (blue). The light amber tesserae should owe their colour to iron (Fe3+) alone or associated with sulphide (S2-) and Ca antimonates. It is likely that the Faragola tesserae were locally produced in a secondary glass workshop.
The coloured tesserae decorating the vaults of the Faragola balneum (Ascoli Satriano, Foggia, southern Italy) / E. GLIOZZO; A. SANTAGOSTINO BARBONE; M. TURCHIANO; I. MEMMI; G. VOLPE. - In: ARCHAEOMETRY. - ISSN 0003-813X. - STAMPA. - 54:(2012), pp. 311-331. [10.1111/j.1475-4754.2011.00616.x]
The coloured tesserae decorating the vaults of the Faragola balneum (Ascoli Satriano, Foggia, southern Italy)
E. GLIOZZO
Writing – Original Draft Preparation
;
2012
Abstract
Twenty-six tesserae (red, orange, yellow, light amber, green, blue and white) from the balneum of the villa at Faragola (Ascoli Satriano, Foggia) have been examined by colorimetry, ICPMS, ICPOES and SEMEDS. Different types of calcareous sands have been used as the source of silica (network former), also providing the stabilizing agent. A natron-type soda source served as the network modifier; however, the use of a sodium-rich plant ash and the recycling process have been hypothesized for the production of two tesserae (FT 1 red and FT 3 orange). The colouring and opacifying agents were Cu oxide (cuprite, orange), metallic copper (red), Pb antimonates (yellow), Ca antimonates (white), a mixture of copper (Cu2+) and Pb antimonates (green), a mixture of cobalt (Co2+) or copper (Cu2+) and Ca antimonates (blue). The light amber tesserae should owe their colour to iron (Fe3+) alone or associated with sulphide (S2-) and Ca antimonates. It is likely that the Faragola tesserae were locally produced in a secondary glass workshop.File | Dimensione | Formato | |
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2012. Faragola III_Archaeometry.pdf
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Descrizione: Gliozzo, E., Santagostino Barbone, A., Turchiano, M., Memmi Turbanti, I., Volpe, G. 2012. The coloured tesserae decorating the vaults of the Faragola's balneum (Ascoli Satriano, Foggia, southern Italy). Archaeometry 54:311-331. DOI: 10.1111/j.1475-4754.2011.00616.x
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