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Back Cover: Chemical Mapping by Macroscopic X‐ray Powder Diffraction (MA‐XRPD) of Van Gogh's Sunflowers : Identification of Areas with Higher Degradation Risk (Angew. Chem. Int. Ed. 25/2018)
Author(s) -
Vanmeert Frederik,
Hendriks Ella,
Van der Snickt Geert,
Monico Letizia,
Dik Joris,
Janssens Koen
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201804575
Subject(s) - monoclinic crystal system , powder diffraction , diffraction , cover (algebra) , crystallography , x ray , materials science , x ray crystallography , optics , chemistry , physics , crystal structure , mechanical engineering , engineering
Sunflowers one of the iconic works of Van Gogh, contains two different chrome yellow pigments: the light‐fast monoclinic PbCrO 4 (crocoite), and the light‐sensitive monoclinic PbCr 1‐ x S x O 4 ( x ≈0.5). In their Communication on page 7418 ff., F. Vanmeert et al. describe how they visualized the distribution of these two pigments throughout the painting's surface using macroscopic X‐ray powder diffraction scanning. In this manner, areas that are at risk of darkening were identified.