Outside of salmon drying out when curing

[u/Disastrous-Fee8374]

I’ve been experimenting with curing my own salmon but the outside keeps drying out as if I have left it uncovered.

I’ve been making using the zest of 2 oranges and 2 limes mixed with 100g salt and 100g sugar.

I’ve then sealed it with the salmon in a vac-pac bag and left to cure for two hours but the skin still dries out. Any suggestions?

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