F10 is definitely the superior product to use. Interestingly I have , as an experiment , soaked my own personal game skins overnight in a saline solution , and then hung them to dry. No dry salting afterwards. They all came out and tanned perfect.
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Jan, I would be interested to see what would happen if you stored them for a while after this treatment.
I would wonder if the skins would develop some rot in storage. Just an experiment.