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

SYSNO ASEP	0447648
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Differentiation between anonymous paintings of the 17th and the early 18th century by composition of clay-based grounds
Author(s)	Hradil, David (UACH-T)_{RID, SAI} Hradilová, J. (CZ) Bezdička, Petr (UACH-T)_{SAI, RID, ORCID} Švarcová, Silvie (UACH-T)_{SAI, RID, ORCID}
Source Title	Applied Clay Science. - : Elsevier - ISSN 0169-1317 Roč. 118, DEC (2015), s. 8-20
Number of pages	13 s.
Language	eng - English
Country	NL - Netherlands
Keywords	paintings ; clay-based grounds ; X-ray powder micro-diffraction ; historical technology
Subject RIV	CA - Inorganic Chemistry
R&D Projects	GA14-22984S GA ČR - Czech Science Foundation (CSF)
Institutional support	UACH-T - RVO:61388980
UT WOS	000365056400002
EID SCOPUS	84941241834
DOI	10.1016/j.clay.2015.08.038
Annotation	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.
Workplace	Institute of Inorganic Chemistry
Contact	Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
Year of Publishing	2016

Number of the records: 1