Do not use Naval Jelly or similar chemicals. These chemicals are strong reducing agents, they actually take the oxygen away from iron oxide and turn it back into iron again. Since bluing is a form of oxidation, it also will un-blue the steel turning it white. I learned this the hard way.
An expert gun appraiser once told me that if you want to ruin a gun's collector's value, go ahead and have it re-blued and have the stock re-finished.
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