Not sure how the average person can get Nitric Acid these days. It is also used to make Nitroglycerin and ammonium nitrate.
Ferric Chloride is the stuff Radio Shack sells as a circuit board echant. I have heard it is good for removing existing bluing also.
A while back I was looking into home wine making. Copper Sulfate is used occasionally to treat wines that smell bad. I think it could be purchased from a winemaking supply house.
-- Dan
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