Get an Exacto knife and cut the cardboard that is attached to that T205 Frank Corridon card. Rinse that card / corrugated cardboard bad boy off under a tap, GENTLY, then place it in a water glass. Add water, 2/3rds of the way full. Set it in a safe place, and then check on it in an hour or two.
My thinking is that the card will be loose from the corrugated cardboard, and the water will have a tinge to it because that corrugated cardboard is nasty stuff. So rinse the card, remove that corrugated cardboard, change to clean water, and soak again.
Then... if that works, which I think it will, then [new collectors quit reading now] run some water in a clean bathtub, 2" to 3" or so, then put the whole thing in the tub, and soak as above.
If there are reprints on there the new cards may not be attached with flour paste; but the old cards may well be. Corrugated cardboard is about 150 years old... it ante-dates the cards.
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