The yellow color to the oxide is the key to this issue. I'm wondering if there is any arsenic used in the case hardening process. There shouldn't be anything in the steel that would oxidize to yellow. Brian shopped quite a while for this, his dream Parker, and B grades certainly don't come cheap. I'm hoping someone can suggest something as the root of the problem. He hunts around Sacramento so I doubt salt water is the issue, though I'm sure the prevailing westerlies can bring some salty air into that area.
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