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Redox reactions in Prussian blue containing paint layers as a result of light exposure
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2013 (English)In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 28, no 4, 524-535 p.Article in journal (Refereed) Published
Abstract [en]

Prussian blue, a mixed valence pigment, typically KFeIII[Fe-II(CN)(6)]center dot xH(2)O, was the most widely used blue artistic pigment from ca. 1720 to the 1970's but, unfortunately, its paint layers, especially when used in conjunction with a white pigment, tend to fade or turn green upon extended exposure to light. In order to identify the mechanism underlying these changes, paint layers have been prepared with differing amounts of these white pigments and subjected to accelerated light exposure fading. The resulting unfaded and faded paint layers as well as both the Berlin white pigment, Fe-2(II)[Fe-II(CN)(6)], and the partially oxidized Berlin green pigment, {KFeIII[Fe-II(CN)(6)]}(x){Fe-III[Fe-III(CN)(6)]}(1-x), have been characterized by Raman and iron-57 Mossbauer spectroscopy. The results indicate that, upon fading, the Prussian blue pigment painted with a linseed oil binder and (PbCO3)(2)Pb(OH)(2) or ZnO, and to a lesser extent with TiO2, undergoes a reduction at the exposed paint surface and an oxidation in the bulk of the paint layer. This combined reduction and oxidation disrupts, at least in part, the Fe-III-N-C-Fe-II intervalent electron transfer pathways in Prussian blue thus leading to pigment fading through a reduction in the intervalent electron transfer absorbance at about 700 nm.

Place, publisher, year, edition, pages
2013. Vol. 28, no 4, 524-535 p.
National Category
Analytical Chemistry
URN: urn:nbn:se:su:diva-89532DOI: 10.1039/c3ja30359dISI: 000316118100012OAI: diva2:619432


Available from: 2013-05-03 Created: 2013-04-29 Last updated: 2013-05-03Bibliographically approved

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Samain, Louise
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