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Grant,
I believe the answer is yes. The coloring you see on the Repro's appears to be chemical colors, possible applied with a mix of chemicals and low heat. I really don't know the method, but it doesn't appear to be carbon infused by pack method or cyanide method. Nitriding would produce similar results to pack case hardening methods, but can be essentially colorless.
The Following User Says Thank You to Chuck Heald For Your Post: