CHR1S wrote:Was this in a wooden frame? My guess is the wood used to make the frame was treated with something (non-archival) and the outer edges of the paper were in contact with the frame.
Grateful69Phish wrote:Not sure id gamble like thst
acid might penetrate
The layer of aluminum provides a barrier that stops acid migration and meets the standard for maximum preservation framing.
Also provides an effective barrier for the rabbets of wooden frames.
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