Okay, I'll go along with the color being a by-product of case hardening and even "secondary" when viewed in that context. But I didn't say the process was closely guarded, but that the "formula and ratio of organic material packed into the crucible with the parts" was closely guarded by each manufacturer.
Good discussion Edgar and I bow to your expertise.
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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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