Well said Edgar.
I take issue however, with your statement that "the colors achieved in the process are a secondary byproduct." If that were the case, Parker, as well as virtually all other gun manufacturers, would not have refined and guarded the formula of the types and ratios of organic material that the receiver and other parts included in the crucible were packed in in order to achieve the colors that are usually definitive to a particular manufacturer.
In my opinion the colors produced in the case hardening process became as intentional as the case hardening itself.
This is not to detract from your very learned description of the hardening process, but only meant to shed light on the intended resultant colors.
Your pal, Dean
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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