http://pubs.acs.org/doi/pdf/10.1021/ac3015627

Photo of the painting “Flowers in a blue vase” painted by

Vincent Van Gogh in 1887??. The part affected by the

discolouration is in the upper right. Credit Kröller-Müller

Museum.

http://www.esrf.eu/news/general/van-gogh-cds/index_html/

Detail : Cd-Oxalate !

http://www.bbc.com/news/science-environment-19597399