Not sure if this is the right forum section, but I am wondering about the proper storage of large vintage photos. These are typically mounted on a thick fiberboard board so that they can be put in a frame. Sizes vary widely and can range from those slightly larger than studio cabinet cards to larger than 11 x 17. The largest sizes are limited to typical wall frame sizes used in a home.
Likely the fiberboard board backer is not acid free so I would need something, or a combination of items, that would also neutralize the acid from the backer board so it does not damage the photo over a long time (many of these photos are over 100 years in old and still look new, but eventually the backer board will cause damage).
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