fading
I'm not an expert however, I've seen valuable old tintypes ruined by being placed in clear vinyl album pages (the type sold for baseball cards) and then left to cook in the sun at an outdoor market. Daguerreotypes, ambrotypes and early tintypes were usually sold in small folding cases. The cases were designed to keep the fragile surfaces of these images safe behind glass. Over the years, the cover glass in the cases can crack or become dirty and ultimately result in fading.
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