Étude du phénomène de brunissement de vitraux médiévaux

Abstract : The so-called "browning phenomenon" is a particular pathology that concerns Mn-bearing medieval glasses that have been exposed to weath-ering conditions. It leads to the appearance of brown stains that hinders, sometimes completely, light transmission through the stained-glass windows, the artefacts ending up illegible. Visual and chemical character-ization of the pathology was performed as to optimize the diagnosis of darkened glasses. The leached layer and the Mn-inclusions were studied to a micrometric scale in order to identify the oxidation state and the atomic environment of manganese ions. In parallel, a review of the exist-ing treatments was performed in order to validate different existing proto-cols previously applied. New tests were conducted in order to provide a better understanding of the possible effects induced on historical glasses by the application of reducing agents.
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E Venault de Bourleuf, J. Ferrand, Stéphanie Rossano, C. Loisel, F. Bauchau, et al.. Étude du phénomène de brunissement de vitraux médiévaux. Sciences des matériaux du patrimoine culturel, Ministère de la Culture, Nov 2012, Paris, France. ⟨hal-01088921⟩

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