On February 14 the BBC reported that scientists have a new theory as to why some of Van Gogh’s paintings appear to be degrading. Specifically, their bright yellows are turning darker. They believe that a previously unknown reaction is occurring on the very thinnest surface layer of these yellow paints. The reaction is primarily driven by UV light and the change in Chromium’s oxidation state from Chromium 6 to Chromium 3.
My interest in this lies in the unique abilities of UV light. Its oxidative properties are useful in a variety of contexts, especially sanitation and sterilization. Because of its low cost (free) and widespread availability (anywhere the sun shines) it is being increasingly used as a method of water purification in third world countries and relief efforts. A greater understanding of the abilities of UV light can widen its applications and make greater use of this free and plentiful resource.
See: http://www.bbc.co.uk/news/science-environment-12453610
Posted by Brad Miller
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So how can we stop these paintings from degrading? I know some paintings are only open to the general public for a limited period on certain days so that they are exposed to less light. Is this why?
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