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Article Dans Une Revue (Data Paper) Journal of the American Ceramic Society Année : 2016

Spectroscopic Investigation of the Coloration and Fabrication Conditions of Medieval Blue Glasses

Résumé

Potash- and soda-lime-stained glasses from the 12th–13th cen- turies, blue-colored by cobalt, have been investigated by Mn, Fe, and Cu K-edge X-ray and optical absorption spectroscopies in order to determine the oxidation state of these elements and their impact on the blue color. Remelting these historical glasses in air at 1200°C, the estimated temperature of medieval furnaces, revealed that these four glasses are more reduced before remelting. This favors Mn as weakly absorbing Mn2+, Fe as Fe2+ and Cu as colorless Cu+. Therefore Fe2+ is the second blue chromophore and copper was not intentionally used by glassmakers to obtain a blue color. A colorimetric analysis indicates that these specific melting conditions have a limited effect on the blue color of these glasses. Based on the spectro- scopic determination of the redox state of Fe, Mn, and Cu, we estimate the oxygen partial pressure in medieval furnaces to be 10 – 7–10 – 9 and 10 – 5 bar for the potash- and soda-lime sam- ples, respectively. The comparison with previous results enables to prove the evolution of furnace technology over centuries.

Dates et versions

hal-03952337 , version 1 (23-01-2023)

Identifiants

Citer

Myrtille Hunault, Fanny Bauchau, Claudine Loisel, Michel Hérold, Laurence Galoisy, et al.. Spectroscopic Investigation of the Coloration and Fabrication Conditions of Medieval Blue Glasses. Journal of the American Ceramic Society, 2016, 99 (1), pp.89-97. ⟨10.1111/jace.13783⟩. ⟨hal-03952337⟩
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