Actually, I have found the whole PE vs mylar debate rather confusing...there are those 'experts' who swear that mylar should only be used for museum-type conditions where humidity, etc., is well-controlled since it does not 'breathe' as much as PE. Others advocate mylar, as it is used by LOC. In the end, though, I probably have more of my prized photos in mylar....I would guess it is more stable over time?
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