Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 27: Postersession KFM
KFM 27.22: Poster
Donnerstag, 15. März 2018, 15:00–17:00, Poster E
X-ray fluorescence and X-ray diffraction analysis of a historical painting — •Fatima Mallal1, Alex von Bohlen2, Christian Sternemann1, Michael Paulus1, Anne Hüsecken1, Paul Salmen1, Wolf-Dieter Köster3, Jörg Hansen4, and Metin Tolan1 — 1Fakultät Physik/DELTA, Technische Universität Dortmund, Germany — 2Leibniz-Institut für Analytische Wissenschaften ISAS, Germany — 3Dortmund, Germany — 4Bachhaus Eisenach, Germany
According to the current state of knowledge, there are only two paintings of Johann Sebastian Bach (1685-1750) which were made during his life time. Both are exhibited in the *Bach House* in Eisenach. We present an X-ray fluorescence (XRF) and X-ray diffraction (XRD) study on a third painting of unspecified origin in order to proof its authenticity, which was performed at beamline BL 9 of DELTA synchrotron radiation source. The XRF data was used to detect the elemental composition of the painting, whereas the XRD pattern provide insight into the crystal structure of colors and pigments. This analysis enables to draw conclusions about the age of the painting, as specific colors are characteristic for certain ages.The XRF analysis showed a predominant contribution of the elements lead, zinc, calcium and barium. We identified the pigments lead white (2PbCO3 Pb(OH)2), lithopone (BaSO4 ZnS), and low amount of zinc white (ZnO) at different regions of the painting. Moreover chalk (CaCO3) was detected. The observation of the different pigments indicates that corrections of the portrait have been made in the 19th century.