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That is my take too Pete. Black rust on carbon steel.

The only issue I have ever heard of with oilingvthem is if they are not actually perfectly dry, then you have the risk of sealing the moisture in by coating it with oil. The most common oil I here...

There are a lot of different means of prevention. I have become a believer in VCI products, both emitters and paper. Also silica gel packs both for means of prevention. The devils spit is corrosion...