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Originally Posted by UncleNick
Peetzakilla,
Not only does an oxide layer do no harm, Hatcher found it does some good. He left new cases on the roof of the Frankford Arsenal for a year, some polished some not. This was in an area where chemical plants kept the air pretty corrosive. It was between the World Wars, before pollution controls. After a year, the polished cases were heavily corroded and eaten through. The unpolished cases were not.
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Interesting result. I'm not surprised that the surface oxidation protected the cases but I would have guessed that the polished cases would have simply oxidized and thus been equally protected.
Me, I polish my cases because it makes them pretty. I guess that goes under "vanity".
