All steel that old will start to form some iron oxide. This is, in fact, a way you can determine if the finish and steel surface is old or recently redone.
You use a surface microscope with a bright light, and look at the grain of the metal. Old blued finishes will show some red iron oxide.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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