We are making high carbon hearth steel in an Aristotle furnace. This principles are simple: combine iron with a charcoal fire and get out high carbon steel perfect for making knives or swords. In practice, this was more difficult. The process here is quite different from smelting iron using a bloomery process in which ore is reduced to iron. We want to make steel by increasing the carbon of the mild steel or iron that is added to the furnace. In practice, this requires an interesting balance between heat and air flow that determines the size of the furnace. The resulting hearth steel needs to be refined by forge welding. It's great to have a power hammer to help with that. Once everything is done, this is great bladesmithing steel and makes beautiful knife and sword blades. The Ace Up Our Sleeve: Emiliano Carrillo at https://www.emilianocarrillo.com/ or https://www.instagram.com/sunandstarsforge/ Referenced videos: Making Viking-Age Bloomery Iron in a Bloomery Furnace https://www.youtube.com/watch?v=FUhv2OnVVDU Refining and Carburizing Wrought Iron https://www.youtube.com/watch?v=ajc8Z38WRsc Intro Music: Evolution by Bensound.com Pattern Welding Explained T-Shirts: RedBubble: https://rdbl.co/2BSFDkr Tee-Spring: https://bit.ly/3hOnhC7 A big thank you to the following Patreon patrons: Andrew Hecker Bill Nibz C. H. László Várady Lucas Gourbeyre Wayne Agostino Support me: https://www.patreon.com/nielsprovos Subscribe: https://youtube/nielsprovos Pictures: https://www.instagram.com/nielsprovos/ Follow me on Twitter: https://www.twitter.com/NielsProvos Like me on Facebook: https://www.facebook.com/NielsProvos Filmed on a Sony PXW‑FS7. Color grading in DaVinci Resolve.