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A Van Gogh underneath a Van Gogh: Characterization

✍ Scribed by Michel Fleck

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
109 KB
Volume
11
Category
Article
ISSN
1369-7021

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✦ Synopsis

Vincent van Gogh, one of the founding fathers of modern painting, was known to save canvas in a very particular way: He reused the canvases of abandoned paintings by covering them with layers of white and then painted over them. It is estimated that about a third of his paintings bear other artwork underneath. Recently, researchers collaborating from a range of institutions have developed a technique to reveal the hidden paintings in astonishing detail using X-ray fluorescence (XRF) elemental mapping (Dik et al., Anal. Chem. 2008, DOI 10.1021/ac800965g). Older methods for investigating covered paintings involve X-ray radiation transmission radiography (XRR) and Infrared Reflectography (IRR), both of which can reveal hidden paintings, but without much detail. Joris Dik of the Delft University of Technology in Holland and his co-workers have used non-destructive XRF elemental mapping, to investigate van Gogh's painting Patch of Grass. Previous analyses had shown that this painting covers the image of a female head, but the details were blurred. Dik and colleagues scanned a 300 cm 2 area of the painting with a narrow beam (0.5 x 0.5 mm 2 ) of quasi-monochromatic synchrotron radiation, using a counting time of 2 seconds per pixel. The whole scan took about two days, separately recording the fluorescence spectra for each pixel. The idea is to identify certain elements by their fluorescence fingerprint. In particular, the distribution of Hg, Sb and Zn reveals the presence of specific paints

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