case-hardening vs case coloring
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case-hardening vs case coloring
What is the difference between case-hardened and case-colored gun parts and how are they processed? Some say there is a significant difference.
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This is one of the more basic explanations I've found. The colors somewhat depend of the carbon source used in the hardening prosess.
http://en.wikipedia.org/wiki/Case_hardening
http://en.wikipedia.org/wiki/Case_hardening