How to Color Case Harden Presented by Larry Potterfield | MidwayUSA Gunsmithing
This video demonstrates the color case hardening process for firearm parts, a technique that hardens the metal surface while creating decorative colors. It details the preparation of a charcoal mixture (3 parts wood to 1 part bone), packing parts tightly in a steel canister to prevent air exposure, and heating the canister to 1400°F for 1 hour and 45 minutes. The process concludes with an immediate quench in aerated water, followed by drying and oiling to reveal the final hardened finish.









