Preprints
https://doi.org/10.5194/mr-2022-13
https://doi.org/10.5194/mr-2022-13
 
08 Jul 2022
08 Jul 2022
Status: this preprint was under review for the journal MR. A revision for further review has not been submitted.

Mechanical ordering of pigment crystallites in oil binder: Can EPR reveal the gesture of an artist?

Elise Garel, Laurent Binet, and Didier Gourier Elise Garel et al.
  • Chimie-ParisTech, PSL University, CNRS, Institut de Recherche de Chimie-Paris, F-75005 Paris, France

Abstract. Is it possible to reconstruct the gesture of an ancient artist applying a paint layer, considering that the orientation distribution of crystallites of an inorganic pigment remains definitively imprinted on the support after drying of the layer? If the pigment contains paramagnetic transition metal ions whose magnetic interactions are themselves anisotropic, then the shape of the EPR spectrum should reflect the distribution of grain orientations. We have demonstrated this effect in the case of Egyptian blue CaCuSi4O10, a pigment used for at least three millennia in antiquity, by reconstructing the probability density of crystallite orientations under various modes of application, such as brush-painting, dabbing and droplet deposition.

Elise Garel et al.

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on mr-2022-13', Anonymous Referee #1, 30 Jul 2022
  • RC2: 'Comment on mr-2022-13', Anonymous Referee #2, 01 Aug 2022

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on mr-2022-13', Anonymous Referee #1, 30 Jul 2022
  • RC2: 'Comment on mr-2022-13', Anonymous Referee #2, 01 Aug 2022

Elise Garel et al.

Elise Garel et al.

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Short summary
Could the gesture of an ancient artist applying a paint layer be reconstructed using EPR analysis? In the case of an inorganic pigment widely used in antiquity, Egyptian blue, where the anisotropy of the Cu2+ EPR signal reflects the symmetry of the pigment crystallites, we have shown that the orientation distribution of the grains, as revealed by simulation of EPR spectra, is indeed influenced by the nature of the gesture.