There might be some sort of moisture/air barrier incorperated in the old paper packaging, but if there is it is not very effective. I have never lived in a dry climate, so have no experience with that and chemicals. But it is also air (oxygen, really) that one must keep out of the packages -- and I have seen the old packaging discolor on the outside over time. Probably as Cyrus observed --- little pinholes in the packaging -- either from handling at the store or wherever -- and that is all she wrote.
Cold (or cool) and dry storage conditions would be optimal. And I was just photographing with the 8x10 at Dry Falls, central WA, about a week ago in 100+ temps!
Vaughn
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