Raman spectroscopy and the conservation of historic painted textiles
Raman spectroscopy and the conservation of historic painted textiles
The appropriate protocol is developed through which Raman spectroscopy can identify the pigments used on historic painted textiles whether in oil or water based paints. It is shown that: samples should ideally be exposed to no more than 5mW power for 10 scans of 10 seconds to reduce the possibility of thermal damage, while an increase to 30 scans will reduce the signal-to-noise ratio if a higher quality spectrum is required for unambiguous pigment identification; a smooth sample surface provides higher spectrum quality; small particle size does not adversely affect the spectrum intensity and fluorescence suppression is best achieved through use of a confocal pinhole set up as photobleaching resulted in possible damage to the artefact.
Raman spectroscopy is also shown to distinguish between the various synthetic polymeric adhesives used during textile conservation to heat-seal crepeline netting to silk, however when applied in situ to a model textile-polymer laminate system confocal Raman spectroscopy is unable to exclude the spectrum of the underlying silk substrate. Depth profiling the laminate demonstrates that focusing just above the polymer surface reduces the relative contribution from the silk, however contrary to confocal theory, lowering the sample ~20 microns below the point of focus results in the relative contribution from the underlying silk increasing to a level comparable with that obtained when focused within the polymer ~3 microns above the silk.
University of Southampton
2004
Macdonald, Averil Mary
(2004)
Raman spectroscopy and the conservation of historic painted textiles.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The appropriate protocol is developed through which Raman spectroscopy can identify the pigments used on historic painted textiles whether in oil or water based paints. It is shown that: samples should ideally be exposed to no more than 5mW power for 10 scans of 10 seconds to reduce the possibility of thermal damage, while an increase to 30 scans will reduce the signal-to-noise ratio if a higher quality spectrum is required for unambiguous pigment identification; a smooth sample surface provides higher spectrum quality; small particle size does not adversely affect the spectrum intensity and fluorescence suppression is best achieved through use of a confocal pinhole set up as photobleaching resulted in possible damage to the artefact.
Raman spectroscopy is also shown to distinguish between the various synthetic polymeric adhesives used during textile conservation to heat-seal crepeline netting to silk, however when applied in situ to a model textile-polymer laminate system confocal Raman spectroscopy is unable to exclude the spectrum of the underlying silk substrate. Depth profiling the laminate demonstrates that focusing just above the polymer surface reduces the relative contribution from the silk, however contrary to confocal theory, lowering the sample ~20 microns below the point of focus results in the relative contribution from the underlying silk increasing to a level comparable with that obtained when focused within the polymer ~3 microns above the silk.
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Published date: 2004
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Local EPrints ID: 465509
URI: http://eprints.soton.ac.uk/id/eprint/465509
PURE UUID: f15f2e31-2127-4019-a6e3-3cafa5988ac3
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Date deposited: 05 Jul 2022 01:31
Last modified: 05 Jul 2022 01:31
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Author:
Averil Mary Macdonald
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