Very interesting and best of all no annoying narration!

I was so happy to see he made new videos.

katana steel is made up of varying sources of fine iron ores like his bacteria slime ore. Hakagane is made from red sands or black sands that are iron rich on coasts of japan and were harvested for swordsmithing or other tools. his low temperature iron production produces a similar starting product that japanese swordsmiths then applied ridiculously advanced materials science to (such as: folding the iron to reduce impurities, differential hardening with the use of clay paint on the quench, different layers of hardness to form an inner and outer structure). I sense that next he is going to be refining (blacksmithing) his metal products. I look forward to the iron bacteria katana.

This is one of the best channels ever.

Make sure you turn on close caption to see all the deets about what's going on.