The spatially resolved characterisation of Egyptian blue, Han blue and Han purple by photo-induced luminescence digital imaging |
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Authors: | G Verri |
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Institution: | (1) The British Museum, Great Russell Street, London, WC1B 3DG, UK |
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Abstract: | The photo-induced luminescence properties of Egyptian blue, Han blue and Han purple were investigated by means of near-infrared
digital imaging. These pigments emit infrared radiation when excited in the visible range. The emission can be recorded by
means of a modified commercial digital camera equipped with suitable glass filters. A variety of visible light sources were
investigated to test their ability to excite luminescence in the pigments. Light-emitting diodes, which do not emit stray
infrared radiation, proved an excellent source for the excitation of luminescence in all three compounds. In general, the
use of visible radiation emitters with low emission in the infrared range allowed the presence of the pigments to be determined
and their distribution to be spatially resolved. This qualitative imaging technique can be easily applied in situ for a rapid
characterisation of materials. The results were compared to those for Egyptian green and for historical and modern blue pigments.
Examples of the application of the technique on polychrome works of art are presented.
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Keywords: | Archeometry/fine arts Fluorescence/luminescence Egyptian blue Han blue/Han purple Imaging Infrared |
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