Monitoring detaching murals in the Convent of Müstair (Switzerland) by optical metrology |
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| Institution: | 1. Department of Mathematics and Science, Pratt Institute, Brooklyn, NY 11205, USA;2. Kunstkonserveringen, Aros Alle 2, 8000 Aarhus C, Denmark;3. Institut des Molécules et Matériaux du Mans (IMMM), UMR CNRS 6283, LUNAM, Université du Maine, Le Mans, France;1. Department of Earth Sciences, Paleomagnetic Laboratory “Fort Hoofddijk”, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, The Netherlands;2. Departamento de Geología, Universidad de Salamanca, Facultad de Ciencias, 37008 Salamanca, Spain;3. Departamento de Petrología y Geoquímica, Universidad Complutense and IGEO, CSIC, 28040 Madrid, Spain;4. Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada;5. Departamento de Mineralogía y Petrología, Universidad de Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain;1. HERCULES Laboratory, University of Évora, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal;2. LIBPhys-UNL, Laboratory for Instrumentation, Biomedical Engineering and Radiation Physics Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal;3. Faculty of Letters, Art History Institute, University of Lisbon, Alameda da Universidade, Lisbon, 1600-214, Portugal;4. Geosciences Department at the Science and Technology School, University of Évora, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal;5. Chemistry Department at the Science and Technology School, University of Évora, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal |
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| Abstract: | The critical condition of detaching historical murals in the Convent of Müstair (Switzerland) prompted a series of investigations and conservation actions over the last 40 years. After percussion tests in 1984/1992, an advanced technology of time-average TV-holography has been applied in 2000 and 2005. The primary aim was to substantiate if and to which extent detaching is in progress. This case study explores characteristics and limits of traditional percussion tests and time-average TV-holography. Extensive mappings by both techniques are carried out on two different structures of wall paintings. The comparison shows that the so-called percussion test – when combined with a close experienced observation – reveals a holistic picture of the general condition of a threatened painting. Time-average TV-holography, on the other hand, yields highly accurate relative information on the spatial distribution of detached areas. Therefore, it is apt to provide an exact answer to the question if detachment is in progress or not. |
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