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My question is this ........ what PROOF exists that sunlight can do this? And, if proof actually exists, has it ever been explained how that happens?
There is no proof. It does not happen.
Stan, my point of view is that assumptons have to be made, such as, in open air where sunlight is available, it is reasonable to believe that oxygen and water in the form of humidity, are also available. The quote above, strips it down even further to exclude firearms case coloring?
Anecdotally, some folks try to retain "patina", which may be at least in part due to oxide formation, because it looks, reflects light, differently than a new finish? Sometimes, one might look under a stock or other part for a closer look at how original colors might have looked? Is every external case colored gun surface subject to "pyramid" wear, maybe?
I also choose the term reflect, over refract, regardless, some skepticism is healthy, but absolutes such as in the quote, have the backing of proof?
