They will fade, especially under sun light or fluorescent.
I've got a 1984 Topps uncut sheet behind plexiglass on my office wall, and it
has faded quite a bit.
I've also got other cards displayed on shelves, and some have faded. None are particularly valuable - they are 1964 Topps Giants.
What I did for my more valuable cards I wanted to display was make a photocopy of them and put them in a holder or a frame.
You cannot really tell they are photocopies at first glance.
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