Thanks for the info.
I am currently displaying an ambro in a case, but opened up flat under an LED (which I believe is awful from a UV standpoint). I also have a bunch of tintypes displayed bare with indirect LED and ambient light. I don't think I have ever seen a faded tintype before, but I don't think I want to wait and find out. I will probably leave everything covered up until I have someone over to look at them.
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