no direct sunlight
I once went on a cruise ship that had a indoor sports bar on the top level with many authentic hand autographed items. They were all nicely displayed throughout the bar. Many were framed on all the walls and looked in curios. When I went back on the same ship two and a half years later virtually all of the autographs were illegible and very faded. So it does not take long for the sun to fade the photos, balls, cards and other items. I don't know if the frames had uv glass but I would guess not.
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