Chemical mapping by macroscopic X-ray powder diffraction (MA-XRPD) of Van Gogh's sunflowers: Identification of areas with higher degradation risk

Frederik Vanmeert*, Ella Hendriks, Geert Van der Snickt, Letizia Monico, Joris Dik, Koen Janssens

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)

    Abstract

    The discoloration rate of chrome yellow (CY), a class of synthetic inorganic pigments (PbCr1−xSxO4) frequently used by Van Gogh and his contemporaries, strongly depends on its sulfate content and on its crystalline structure (either monoclinic or orthorhombic). Macroscopic X-Ray powder diffraction imaging of selected areas on Van Gogh's Sunflowers (Van Gogh Museum, Amsterdam) revealed the presence of two subtypes of CY: the light-fast monoclinic PbCrO4 (LF-CY) and the light-sensitive monoclinic PbCr1−xSxO4 (x≈0.5; LS-CY). The latter was encountered in large parts of the painting (e.g., in the pale-yellow background and the bright-yellow petals, but also in the green stems and flower hearts), thus indicating their higher risk for past or future darkening. Overall, it is present in more than 50 % of the CY regions. Preferred orientation of LS-CY allows observation of a significant ordering of the elongated crystallites along the direction of Van Gogh's brush strokes.

    Original languageEnglish
    Pages (from-to)7418-7422
    JournalAngewandte Chemie - International Edition
    Volume57
    Issue number25 (Special Issue)
    DOIs
    Publication statusPublished - 2018

    Bibliographical note

    Special Issue: Heritage Science Plus Analytical Chemistry, Spectroscopy, and Bioanalysis

    Keywords

    • analytical methods
    • dyes/pigments
    • imaging
    • lead
    • X-ray diffraction

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