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Communication Dans Un Congrès Année : 2022

Shattered Glass – An Unusual Alteration Process in a 5th-Century BCE Archaeological Glass

Résumé

This study presents a very unusual type of deterioration in an archaeological glass object: glass shattering. The glass objects studied were recovered from the Casas del Turuñuelo archaeological site in Guareña, Spain, which dates to the 5 th century BCE. Two translucent bowls presented typical types of degradation from burial, while a third was completely shattered. Fragments from one reconstructed bowl and the shattered object were studied and compared using stereomicroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, Vickers hardness test, and polariscopy. While the chemical compositions of the objects are the same, their mechanical properties differ. The shattered glass comprises several fissures, with and without alteration, as well as severely stressed areas with varying hardness, confirming the modification of the glass matrix. Our hypothesis is that a post-production fire heated the now-shattered object and cold air quickly lowered the temperature, resulting in internal tensions in the glass.
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Dates et versions

hal-03866990 , version 1 (23-11-2022)

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  • HAL Id : hal-03866990 , version 1

Citer

Teresa Palomar, Nadine Schibille, Esther Rodríguez González, Sebastian Celestino, Joaquín Barrio. Shattered Glass – An Unusual Alteration Process in a 5th-Century BCE Archaeological Glass. Recent Advances in Glass and Ceramics Conservation 2022 6th Interim Meeting of the ICOM-CC Glass and Ceramics Working Group2022, 2022, Lisbon, Portugal. pp.155-162. ⟨hal-03866990⟩
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