Chemical analysis of 17th century Millefiori glasses, excavated in the Monastery of Sta. Clara-a-Velha, Coimbra, Portugal: Comparison with Venetian and Façon-de-Venise production.

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Abstract

A selection of 17th century archaeological glass fragments of Millefiori and pick-up decorated vessels from the Monastery of Sta. Clara-a-Velha in Coimbra, Portugal, was analyzed by optical microscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, electron probe microanalysis and Raman microscopy in order to identify the glass type, colorants and opacifiers used in the body and in the polychrome slices of canes or chips of glass applied in the decoration. The results showed that the transparent glasses are of the soda-lime-silica type and the blue colours were due to cobalt or copper. The opaque white glasses can be classified as soda-lime-silica-lead with tin oxide as opacifier, except for one glass where calcium antimoniate was used. The red colour is due to nanoparticles of copper. The results obtained showed groups with different compositions. In an attempt to determine the production centre of the Millefiori glass vessels from this archaeological site, the results were also compared with the composition of Venetian and European glasses from the same period. The composition and style of one vessel is comparable to the Venetian production and the provenance of the remaining fragments is under study.
Original languageUnknown
Title of host publication-
Pages72
Publication statusPublished - 1 Jan 2010
Event1st International Congress Chemistry for Cultural Heritage (ChemCH) 2010. Ravenna, Italy, 30 June-3 July 2010 -
Duration: 1 Jan 2010 → …

Conference

Conference1st International Congress Chemistry for Cultural Heritage (ChemCH) 2010. Ravenna, Italy, 30 June-3 July 2010
Period1/01/10 → …

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