Raman spectroscopic study of a post-medieval wall painting in need of conservation |
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Authors: | Email author" target="_blank">Howell?G?M?EdwardsEmail author Dennis?W?Farwell Christopher?J?Brooke |
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Institution: | (1) Chemical and Forensic Sciences, School of Pharmacy, University of Bradford, Bradford, BD7 1DP, UK;(2) Department of History, University of Nottingham, Nottingham, NG7 2RD, UK |
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Abstract: | Raman spectroscopic studies of four specimens from an important angel wall painting in need of conservation work in a medieval
church have provided some information about the pigments and pigment compositions which will influence possible future preservation
and restoration strategies. Excitation of the Raman spectra at 1,064 nm in macroscopic mode and at 785 nm in microscopic mode
revealed that the white pigment on the angel's wings was a mixture of barytes with calcite and lead white in minor composition.
Although the specimens provided were not directly associated with coloured regions of the painting, yellow and blue microcrystals
were found and they were identified as chrome yellow and lazurite, respectively. Red and brown particles were identified as
cinnabar/vermilion and haematite. Several green particles were also found but could not be identified. The green and blue
crystals could be related to neighbouring coloured regions of the artwork and the yellow colour could be identified as a background
to the angel figure. Particles of carbon were found to be dispersed throughout the specimens and can be ascribed to soot from
candles, heating stoves or oil lamps providing lighting in the church. No evidence for biological deterioration was found
from the spectra. The unusual pigment palette is strongly suggestive of a later date of painting than was originally believed
but there is a possibility that an earlier rendition exists underneath. Following a review of the spectroscopic data, a more
extensive sampling protocol is recommended, from which some stratigraphic evidence could identify the underlying plaster and
possible artwork. |
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Keywords: | Raman spectroscopy Wall painting Conservation Pigments |
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