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What do you recommend as a solution to harden paper?
(libranet.de)
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Your best bet would be PVA (Poly vinyl alcohol), which is a water soluble plastic and usually the base of wood glue or water based paper glue.
Dilute it in warm water and soak your paper in it.
Starch is too stiff and crumbly for that use case.
@Guenther_Amanita thanks!