Optically coated acrylic is the ideal choice, but it's ridiculously expensive for routine use. I don't use any kind of tinted allegedly UV-protective plastics. For one reason, their pinkish or yellowish tint spoils certain hues, especially blue and cyan Second, from my own testing, it seems they offer only a very minor amount of UV protection which is hardly a substitute for proper lighting devoid of UV to begin with, or at least low in UV. Back when I tested em with Cibachrome, there was only about a 5% improvement in the rate of dye fading.
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