Blued steel
Version vom 18. Februar 2010, 00:14 Uhr von Torsten (Diskussion | Beiträge) (Die Seite wurde neu angelegt: '''Blued steel''' Steel parts are slowly and cautiously heated (annealed) to about 300°C. This process coats the metal with an extremely thin, shimmering film of cor...)
Blued steel
Steel parts are slowly and cautiously heated (annealed) to about 300°C. This process coats the metal with an extremely thin, shimmering film of cornflower-blue magnetite (Fe3O4).