steel blueing

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blueing — /ˈbluɪŋ/ (say bloohing) noun 1. the process of colouring or tingeing something blue. 2. the production of a film of blue oxide on polished steel. 3. treatment of clothes with blue to increase their whiteness. Also, bluing …
Case hardening — or surface hardening is the process of hardening the surface of a metal, often a low carbon steel, by infusing elements into the material s surface, forming a thin layer of a harder alloy. Case hardening is usually done after the part in question … Wikipedia
Patina — For the village in Estonia, see Pattina. For the United States Navy ship, see USS Pattina (SP 675). A bronze coin of the Han Dynasty circa 1st century BC with green patina. Patina ( … Wikipedia

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