Microtextures recording melting-history of a medieval glass cake

Messiga, Bruno; Riccardi, María Pia; Rebay, Gisella; Basso, Elena; Lerma, Simone

doi:10.1016/j.jnoncrysol.2004.06.009

Cited by 11 publications

(11 citation statements)

References 5 publications

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“…The compositions of the medieval-like glass varieties to be reproduced were established on the basis of archaeometric studies [1][2][3][4][5][6][7][8]. Preparation conditions were optimized following procedures aiming to reproduce Central European medieval glass and reported in literature [12,13,20,21,29].…”

Section: Methodsmentioning

confidence: 99%

“…The most characteristic chemical features of glass used in the Middle Ages for the production of cathedral windows in Central Europe are low levels of SiO 2 (often lower than 60 wt.%), high levels of K 2 O (12-26 wt.%) and CaO (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27) wt.%), and the presence of P 2 O 5 (1-6 wt.%) and MgO (2-7 wt.%) resulting from the use of beech and fern ashes as fluxing agents after about 1000 AD [1][2][3][4][5][6][7][8][9]. This kind of glass, known as PLS (Potash-Lime-Silica glass), was produced by mixing one part washed sand, or ground quartz pebbles, and two parts beech wood ash, as testified by the Benedictine monk Teophilus in "De diversis artibus" [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Structural and vibrational characterization of medieval like glass samples

Ferri

Bersani

Lorenzi

et al. 2012

Journal of Non-Crystalline Solids

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural and vibrational characterization of medieval like glass samples

Ferri

Bersani

Lorenzi

et al. 2012

Journal of Non-Crystalline Solids

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“…Furthermore, the microtextures of the newly formed mineral phases such as wollastonite suggest that complex reactions occurred during batch melting. Large euhedral crystals derive from thermally stable melts with low nucleation and high growth rates; on the other hand, embayed crystals form through the reabsorption of wollastonite by a melt undersaturated in its components (Messiga et al 2004). Nevertheless, the presence of a few aggregates of small Ca-Na silicates ('devitrification' phases) suggests relatively rapid cooling and, consequently, high nucleation and slow growth rates.…”

Section: Red Slabsmentioning

confidence: 99%

THE SECTILIA PANELS OF FARAGOLA (ASCOLI SATRIANO, SOUTHERN ITALY): A MULTI‐ANALYTICAL STUDY OF THE RED, ORANGE AND YELLOW GLASS SLABS*

Barbone

Gliozzo

d’Acapito³

et al. 2007

Archaeometry

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SEM–EDS, EMPA, ICP–MS and ICP–OES were applied to the study of three sectilia panels made of red, orange and yellow glass slabs. In order to determine the chemical state of Cu, XAS was also performed. The results indicate that, with the exception of the red samples, all slabs were made by mixing a siliceous sand with natron. The red slabs show significant compositional differences with respect to K2O and MgO contents, probably linked to the use of plant ashes as a source of alkali. The red, orange and yellow slabs are coloured by metallic copper, cuprite and Pb antimonates, respectively. The comparison between the chemical composition of the Faragola samples and several glass reference groups did not provide conclusive evidence of provenance.

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“…The surrounding high-copper particles and air bubbles are indicative of a chemical reaction between the inclusion and the glass matrix. Inclusions of this kind are accompanied by calcium-silica crystals, probably wollastonite, one of the devitrification phases commonly precipitating inside the glass melt [79]. It has been widely assumed that Roman orange glasses were typically colored using either metallic copper or copper alloys, possibly in the form of scale, from metallurgical workshops [75,80,81].…”

Section: Cobalt and Copper As Colorantsmentioning

confidence: 99%

The Color Palette of the Mosaics in the Roman Villa of Noheda (Spain)

et al. 2020

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Excavations at the Roman villa of Noheda (Spain) revealed the remains of an exceptionally elaborate fourth-century floor mosaic that contains a surprisingly large number of glass tesserae, representing a broad spectrum of colors. This paper presents the results of the chemical (LA-ICP-MS) and microstructural analyses (SEM-EDS, XRPD) of 420 glass tesserae from these mosaics. The high number of data allowed us to establish the compositional variability and to elucidate questions of supply in relation to a large-scale artistic campaign. The tesserae from Noheda were almost exclusively made from recycled mixed Roman Mn and Sb base glass, thus demonstrating that recycling of Roman base glasses was common practice in the fourth century, occurring on a near industrial scale. It also suggests that the workshops specializing in the production of mosaic tesserae might have been in the western Mediterranean. A limited number of coloring and opacifying additives (Mn, Co, Cu, Sb, Pb) were identified, which resulted in a wide range of hues. These were differentially associated with various trace elements, which implies the use of different raw materials. A sub-set of red, green, and orange tesserae reflect distinct base glass characteristics as well as coloring technologies that point to an Egyptian provenance.

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Microtextures recording melting-history of a medieval glass cake

Cited by 11 publications

References 5 publications

Structural and vibrational characterization of medieval like glass samples

Structural and vibrational characterization of medieval like glass samples

THE SECTILIA PANELS OF FARAGOLA (ASCOLI SATRIANO, SOUTHERN ITALY): A MULTI‐ANALYTICAL STUDY OF THE RED, ORANGE AND YELLOW GLASS SLABS*

The Color Palette of the Mosaics in the Roman Villa of Noheda (Spain)

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