Message
A couple of comments:
First, from the Wikipedia article on foxing:
"The causes of foxing are not well understood. One theory is that foxing is caused by a fungal growth on the paper. Another theory is that foxing is caused by the effect on certain papers of the oxidation of iron, copper, or other substances in the pulp or rag from which the paper was made. It is possible that multiple factors are involved.
High humidity may contribute to foxing."
In short, foxing is not light related. The foxing under the mat may have occurred after matting.
Second, the mat appears acidic and is damaging your painting - the band across the top is not foxing. It should be removed.
Regards,
Stan
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