Koen Janssens

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The research team led by Koen Janssens investigated the breakdown of the bright yellow chrome colors into a matt brown tone (Vincent van Gogh: Fallende Blätter).
Vermillion's red color turns black due to the formation of elemental mercury ( Peter Paul Rubens : Adoration of the Magi)
Using the painting Susanna and the Elderly ( Rembrandt ), the advantages and disadvantages of X-ray fluorescence analysis could be compared with autoradiography . In this painting, the pigment leg black was examined in particular .

Koen HA Janssens (* 1963 ) is a Belgian chemist. He is a professor at the University of Antwerp .

Janssen studied chemistry and received his doctorate from Piet van Espen at the University of Antwerp .

In his research Janssens deals with the analysis of color pigments , especially in historical paintings and other works of art. As a technique he mainly uses X-ray fluorescence analysis, which can be used without damaging the material (non-destructive). From these studies important conclusions can be drawn about the conservation of the works of art.

Janssens and his colleagues were able to reveal a hidden face of a woman under the painting Patch of Grass by Vincent van Gogh . In another painting by Vincent van Gogh, the compound plumbonacrite was demonstrated and important knowledge gained about the breakdown process of the red lead pigment lead (II, IV) oxide in angelsite and cerussite . Another study examined the fading of the yellow cadmium sulfide pigments on paintings by James Ensor .

Works

  • KHA Janssens (Ed.), FCV Adams (Ed.), A. Rindby (Ed.): Microscopic X-ray Fluorescence Analysis . Wiley, 2000, ISBN 978-0-471-97426-0 .
  • KHA Janssens (Ed.): Modern Methods for Analyzing Archaeological and Historical Glass . 1st edition. Wiley, 2013, ISBN 978-0-470-51614-0 .

Web links

Individual evidence

  1. ^ SRF: Van Gogh exhausted
  2. ↑ Paintings turning black? Blame mercury
  3. ↑ There is more to a Rembrandt than meets the eye, science shows (sciencedaily.com)
  4. ^ Biographical data, publications and academic family tree of Koen Janssens at academictree.org, accessed on February 15, 2018.
  5. ↑ J. Dik, K. Janssens, G. van der Snickt, L. van der Loeff, K. Rickers, M. Cotte: Visualization of a Lost Painting by Vincent van Gogh Using Synchrotron Radiation Based X-ray Fluorescence Elemental Mapping . In: Analytical Chemistry . tape 80 , no. 16 , 2008, p. 6436-6442 , doi : 10.1021 / ac800965g .
  6. ↑ F. Vanmeert, G. van der Snickt, K. Janssens: Plumbonacrite Identified by X-ray Powder Diffraction Tomography as a Missing Link during Degradation of Red Lead in a Van Gogh Painting . In: Angewandte Chemie . tape 127 , no. 12 , 2015, p. 3678-3681 , doi : 10.1002 / anie.201411691 .
  7. ↑ G. van der Snickt, J. Dik, M. Cotte, K. Janssens, J. Jaroszewicz, W. de Nold, J. Groenewegen, L. van der Loeff: Characterization of a Degraded Cadmium Yellow (CdS) Pigment in an Oil Painting by Means of Synchrotron Radiation Based X-ray Techniques . In: Analytical Chemistry . tape 81 , no. 7 , 2009, p. 2600-2610 , doi : 10.1021 / ac802518z .
personal data
SURNAME Janssens, Koen
ALTERNATIVE NAMES Janssens, Koen H. A
BRIEF DESCRIPTION Belgian chemist
DATE OF BIRTH 1963