Sunday, September 16, 2012

Van Gogh Varnish Discoloration

Using sophisticated x-ray beams at two synchrotron sources in Europe, scientists have identified a previously unknown degradation process between paint and protective varnish in Van Gogh's painting, Flowers in a blue vase, a reaction between the cadmium sulphide in the paint and lead ions in the varnish to form an opaque anglesite (PbSO4) and cadmium oxalate (CdC2O4).

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