Although I am not a metalurgist (spell?) I can speak to at least one point regarding pitting. Pitting startes either from specific acid concentration on one spot (like a drop of blood spatter on a blade) or on impurities in the metal that will oxidize quicker than the rest of the blade. Also, acidity varies from milimeter to milimeter in nature (for example in acidic soil). Even rusting or even patina comes from human intervention in some form or fashion (even in storage where patina may appear even).
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