Soaking Stamps

I tried 1/5 teaspoon of Kosher salt (no anti-caking additive) into 1/3 cup filter water (~ 3% saline), and one capsule of Pacreatin. It helped a bit, though it could also be that these stamps have seen quite a bit of soak time.   Still acouple of stamps scrolled up, but they weren't as difficult to flatten and get = from blotter to drying book,

I am out of 'problem' stamps so whether a higher saline concentration helps (or maybe it makes little difference at all)... will have to wait a while.

Fortunately I don't see this issue with all early Austrian stamps.