Soaking
Hi Tim.
If you soak them too long, the front of the card will separate from the cardboard back. This doesn't seem to happen with Jell-O or Post Canadians, just the regular Post Cereal cards. But that may not be completely correct.
If it's a water soluable glue, they shouldn't need to soak too long. I would say, put them in a saucer of water, front side up. Maybe a minute would be enough to work on the water soluable glue.
Of course, experiment with the least valuable cards 1st.
Good luck.
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