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【Noteworthy Chemistry@ACS】梵高作品解析
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http://portal.acs.org/portal/acs ... _var=region1#P9_456 这个技术，是否可以赚大把钞票啊？ 那些收藏家们不知道会不会感兴趣？ A head lies under Van Gogh’s Patch of Grass. Vincent van Gogh (1853–1890) was always low on cash, so he often recycled canvases by painting over earlier works. J. Dik of Delft University of Technology (The Netherlands) and coauthors in Belgium, The Netherlands, Germany, and France have teased out the details of a woman’s portrait under one of Van Gogh’s Impressionist-inspired paintings, Patch of Grass. The authors focused on Patch of Grass because they knew from previous analysis that a painting of a woman’s head lay beneath the visible work. They recorded decimeter-scale X-ray fluorescence (XRF) intensity maps that showed the distribution of specific elements in the paint layers. From these data, they were able to visualize Van Gogh’s brushstrokes and details of the woman’s face, such as her eyes, nose, mouth, and chin. In conventional X-ray radiography, the absorption of primary X-rays is recorded; but in XRF mapping, the intensity of element-specific secondary radiation (energy emitted by atoms while an energetic X-ray beam scans over the surface) is measured. The authors’ XRF mapping showed several elemental distributions that mostly belonged to the surface painting. Lead showed a fairly homogeneous distribution, suggesting that Van Gogh had placed a lead-based white priming layer over the earlier painting before embarking on Patch of Grass. However, two elements were directly connected by XRF mapping to the painting of the woman—mercury and antimony. Mercury is associated with vermillion, a red pigment that contains HgS. Not surprisingly, the investigators found the red pigment to be mostly on the lips and cheek of the woman. The origin of antimony was a bit confusing. The authors thought that Pb2Sb2O7—also known as Naples yellow—was the source, because Van Gogh used the pigment frequently. However, the distributions of lead and antimony did not match. The use of X-ray absorption near-edge structure, a type of absorption spectroscopy, confirmed that the antimony belonged to Naples yellow. The researchers believe that the pigment had been mixed with zinc white and lead white to produce lighter parts of the painting. (Anal. Chem. 2008, 80, ASAP article DOI: 10.1021/00965g; Rajendrani Mukhopadhyay) [The contributor is a senior associate editor for Analytical Chemistry.—Ed.] [search]梵高[/search] [ Last edited by weihui_cn on 2008-8-5 at 13:50 ] |
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