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Forensic science international v.271, 2017년, pp.1 - 7   SCI SCIE
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A definitive analytical spectroscopic study of Indian yellow, an ancient pigment used for dating purposes

de Faria, Dalva L.A. (Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, Butantã, 05508-000 São Paulo, SP, Brazil ); Edwards, Howell G.M. (Department of Chemical and Forensic Sciences, University of Bradford, Bradford, West Yorkshire BD7 1DP, UK ); Careaga, Valeria (UMYMFOR and Departamento de Química Orgánica, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina ); Walt, Nicholas (L. Cornelissen & Son Ltd., 105 Great Russell Street, London WC1B 3RY, UK ); Maier, Marta S. (UMYMFOR and Departamento de Química Orgánica, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina );
  • 초록  

    Abstract The Raman spectrum of tartrazine has been mistakenly reported as being that of Indian yellow in the literature, which has serious consequences for the identification of this pigment in art works regarding their authentication. Unlike tartrazine, Indian yellow (a natural mixture of the magnesium and calcium salts of euxanthic acid) exhibits in its Raman spectrum a strong fluorescent background when visible excitation is used, however, excitation in the near infrared (1064nm) permitted the observation of the Raman bands from the raw pigment with the main features placed at 1346, 1368, 1425, 1441 and 1626cm −1 . Indian yellow identification was assured by 1 H and 13 C Nuclear Magnetic Resonance characterization and the complete assignment of the proton and carbon resonances was accomplished using heteronuclear single quantum correlation (HSQC), heteronuclear multiple bond correlation (HMBC), nuclear overhauser effect spectroscopy (NOESY) and 1 H– 1 H correlation spectroscopy (COSY). Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and X-ray fluorescence (XRF) analyzes were also conducted on a genuine sample of this historical pigment. Highlights The Raman spectrum and NMR characterization of Indian yellow is reported. Tartrazine has been mistakenly reported as being that of Indian yellow. Indian yellow is highly luminescent and its Raman spectrum was obtained at 1064nm. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Indian yellow .   Raman spectroscopy .   Pigment .   Artwork .   Tartrazine.  

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