Analytical study of polychromy on exterior sculpted stone
作者： M. J. Campos-Suñol , M. J. De la Torre-Lopez , M. J. Ayora-Cañada , A. Dominguez-Vidal
DOI: 10.1002/JRS.2379
关键词:
摘要: A complete study on the remnants of polychromy in main entrance portal Saint Paul's church (16th century, Ubeda, Spain) has been carried out using Raman microspectroscopy combination with optical microscopy and scanning electron energy dispersive X-ray spectroscopy (SEM-EDX). The red areas showed superposition two well-defined pictorial layers. first one (probably original) was composed cinnabar, lead hematite over a preparation coating containing calcite, gypsum white. second layer mainly constituted by cinnabar thicker coating. Green samples single weathered stone. high fluorescence background made examination latter extremely difficult means microspectroscopy. SEM-EDX detected abundance copper chlorine, detailed inspection spectra revealed presence hydroxychloride, analogous to naturally occurring mineral atacamite. Azurite original were only found cracks mortar joints. Alteration products like calcium oxalates also widely distributed this layer. Copyright © 2009 John Wiley & Sons, Ltd.
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