not a scientist
but I think one of the major factors in fading is that light is reacting with the chlorine in our air. As mentioned earlier UV (A&B) blocking is an effective tool in mediating some of the loss one might anticipate without it, but it won't eliminate it. I am rarely right however :-) I wonder if the ball was encased in a vacuum tight container with such protection if there would be any fading.....
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