Hi George:

I've run some tests over the years.....casing two identical pieces of steel....put one out in the sun...leave one in a drawer.....ultimately, the one outside will lose it's color quite fast....like 6 mos....the one in the drawer will stay brilliant..?? Of course, that was the Arizona-Utah sun, which is the real deal as far as sun goes.............when I say lose, I mean a fade, not complete loss.....obviously the longer you leave it out, the more it fades....

That has been my experience...so I would have to stand by it ...other fellows have confirmed this as well...

Best Regards,

Doug