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Investigation of pigment degradation due to acetic acid vapours; Raman spectroscopic analysis

Nathalie De Laet, Sylvia Lycke, Jolien Van Pevenage, Luc Moens and Peter Vandenabeele
Investigation of pigment degradation due to acetic acid vapours; Raman spectroscopic analysis (in Geo-Raman X, Jean Dubessy (editor))
European Journal of Mineralogy (December 2013) 25 (5): 855-862

Abstract

The preservation of moveable cultural heritage objects inside museums includes trying to keep these objects under the best conditions as possible. This is done, amongst others, by controlling the atmospheric conditions under which the objects are preserved: the amount of light, temperature and relative humidity, etc. should be carefully monitored in exhibitions as well as in storage rooms. However, other atmospheric components may as well be important for the optimal preservation of cultural heritage materials, such as acetic compounds derived from wood package. A study of the degradation of malachite, leadwhite, lead-tin yellow type I, red lead and pigment orange 36 is performed using Raman spectroscopy. The degradation of these pigments was analyzed after exposure to acetic acid vapours. Three different acetic acid concentrations in the atmosphere were tested: ca. 150 ppm, ca. 300 ppm and ca. 500 ppm. In all conditions, the relative humidity was kept constant at ca. 75 %. A possible colour change, which can go hand in hand with the degradation process, was evaluated by observing the change of the RGB values of the sample colour. Besides pigment orange 36, which showed to be unreactive towards the acid atmosphere, acetate species were generated for each pigment: malachite reacted towards a verdigris variety; red lead, leadwhite and lead-tin yellow degraded towards lead acetate. At high doses, red lead alters towards a black pigment, which is presumed to be plattnerite.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 5
Title: Investigation of pigment degradation due to acetic acid vapours; Raman spectroscopic analysis
Title: Geo-Raman X
Affiliation: Ghent University, Department of Analytical Chemistry, Ghent, Belgium
Affiliation: Universite de Lorraine, Nancy, France
Pages: 855-862
Published: 201312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
Meeting name: 10th Geo-Raman meeting
Meeting location: Nancy, FRA, France
Meeting date: 20120611June 11-13, 2012
References: 22
Accession Number: 2014-004525
Categories: Mineralogy of non-silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201404
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