Rot proofing recipes for cotton

I just bought a pair of the old Australian Army Crimea waisted jungle trousers on ebay.
Call it a bout of nostalgia for my lost youth but these are my size[ not the size I was when I wore the Green] and tho expensive the beloved wife paid for them
While very well made pants they do suffer from mildew degradation easily. Can some-one help me find a recipe for the rotproofing solution made with copper sulphate?
I had all these recipes on the computer that died and my Gogglefoo is either not working or the government censorship of the web is blocking access to these sites


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