<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by GeorgeBurdell:
Flashes are a serious issue with paintings. Although your one flash might not do any damage, when you multiply it by several hundred thousand per year...</font>
I read this from somewhere recently (sorry, cannot remember my source
). One camera flash on a painting is equivalent to 3 days worth of direct sunlight.