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Differentiation between anonymous paintings of the 17th and the early 18th century by composition of clay-based grounds

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    0447648 - ÚACH 2016 RIV NL eng J - Journal Article
    Hradil, David - Hradilová, J. - Bezdička, Petr - Švarcová, Silvie
    Differentiation between anonymous paintings of the 17th and the early 18th century by composition of clay-based grounds.
    Applied Clay Science. Roč. 118, DEC (2015), s. 8-20. ISSN 0169-1317
    R&D Projects: GA ČR GA14-22984S
    Institutional support: RVO:61388980
    Keywords : paintings * clay-based grounds * X-ray powder micro-diffraction * historical technology
    Subject RIV: CA - Inorganic Chemistry
    Impact factor: 2.586, year: 2015

    Numerous anonymous paintings are preserved in depositories of European galleries. The reasons why they are not being shown to the public differ, but one of them is their doubtful attribution and relative dating. There is a large amount of unsigned paintings of varying artistic quality and also lots of copies of unknown provenance. We have found out that mineralogical analysis based on X-ray powder micro-diffraction measurements is able to provide exact parameters for the classification of earthy ground layers of paintings into well-defined types. In the period of the 17th and the early 18th century, these types were regionally specific, because various coloured clay-based materials became popular thanks to significant changes in the painting technology. They gradually substituted previously used white chalk and/or gypsum (gesso). Within comparative research performed on paintings from Czech collections, we were able to distinguish those of Italian and those of Central-European provenance. We have defined five types of grounds that differ in clay minerals' structures (presence of expandable and interstratified structures, various crystallinity indices etc.) and their relative contents, and, in addition, in characteristic elemental ratios and admixtures, either natural or artificial.
    Permanent Link: http://hdl.handle.net/11104/0249455
     
Number of the records: 1