I seem to remember from back in the infancy of my doublegun education on this site, a post by Oscar to the effect that he had seen guns displayed in a sunlit display case where one side of the case color had faded and the other side had not. His reaction to that was that he could think of no scientific reason for the sun to have faded the color, but obviously, it did. Don't trust MY TERRIBLE MEMORY to settle your bet though...Geo