| Autor: |
BRANDA, FRANCESCO, LUCIANI, GIUSEPPINA, COSTANTINI, ANIELLO, G. Laudisio, M. Vandini |
| Přispěvatelé: |
Branda, Francesco, Luciani, Giuseppina, Costantini, Aniello, G., Laudisio, M., Vandini |
| Jazyk: |
angličtina |
| Rok vydání: |
2002 |
| Předmět: |
|
| Popis: |
An ancient musive glassy tessera was investigated and the results arc reported in this paper The tessera was recovered from the Ninfeo of Punta Epitaffio luring the underwater excavation in the sea in front of Baia, which nowadays is a little town near Naples. In the First century AD a country scat of the roman emperor was built there. The experimental results suggest that calcareous sand and natron were used to make the tessera; the azure colour would be due to Co while Ca2Sb2O- was used to opacify, The glass has a very high liquidus temperature, T-l=1180degreesC; however, it was made presumably around 700degreesC where the glass shows a sufficiently low viscosity and good stability towards crystallisation. Two crystalline phases arc present on the surface: silica and calcium carbonate, The v could be the result of surface degradation of the glass. However, silica could also be the result of limited surface crystallisation tit the glass pore interface during the glass making. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
