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Old 01-06-2015, 08:28 PM
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DWalt DWalt is offline
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Perhaps some of the earlier formulations of H #9 may have contained ammonia, which might attack copper, were the copper somehow exposed to it. And, some who don't know any better just assumed that S&W applied copper plating as a substrate under the nickel plating. One conclusion could be that H #9 is therefore bad to use on anything nickel plated. But as S&W nickel plates directly on steel (and I believe always has), and that nickel is unaffected by exposure to almost every solvent, acid, or base known to chemistry (maybe it might be affected by Aqua Regia or Hydrofluoric Acid, but I don't know about that), certainly H #9 won't do anything to the plating. It is made of almost all organic materials, and no acids or bases.

In any event, anything you may read about how evil Hoppe's #9 is around anything nickel plated, rest assured it is total BS.
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