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Title: Microscopy and Microanalysis of an Extreme Case of Salt and Biodegradation in 17th Century Wall Paintings
Authors: Gil, Milene
Martins, M. Rosário
Carvalho, M. Luisa
Souto, Cátia
Longelin, Stephane
Cardoso, Ana
Mirão, José
Candeias, António
Editors: Price, Robert L
Keywords: mural painting
Issue Date: Jun-2015
Publisher: Microscopy Society of America
Citation: Milene Gil,Maria Rosário Martins, Maria Luísa Carvalho, Cátia Souto, Stephane Longelin, Ana Cardoso, José Mirão, António Estevão Candeias (2015). Microscopy and Microanalysis, 21(3):606-16. DOI:10. 1017/S1431927615000562
Abstract: The present study characterizes the main deterioration mechanisms affecting the early 17th frescoes of Casa de Fresco, the only known example in Portugal of a semi-underground leisure room richly decorated with a balcony over a water well. Frescoes from the vault are at risk due to salt weathering and biodeterioration. The aim of the research was identification of the deterioration materials, determination of their origin, and their effect on the frescoes before future intervention. Scanning electron microscopy with an energy-dispersive X-ray detector (SEM-EDS) was used to determine salt morphology and microanalysis. The mineralogical characterization was performed by X-ray powder diffraction, complemented with µ-Raman and µ-Fourier transform infrared spectroscopy. Biological assessment was evaluated with optical microscopy and SEM-EDS. Bacterial and fungal isolation and identification were performed using standard culture media and methods according to Bergey's Manual of Systematic Bacteriology and from the Compendium of Soil Fungi. The results show that Ca and Ca-Mg carbonates from the paint renderings are the predominant salt species affecting the site. Bacterial strains from the genera Bacillus and Pseudomonas and fungal strains from the Cladosporium spp. and Penicillium spp. were isolated in the salt formations, within and between the mortar layers. Azurite, malachite, and smalt paint layers are the most affected by the weathering conditions.
ISSN: 1431-9276
Type: article
Appears in Collections:HERCULES - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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