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How is Japan? Japan sword making has handled this carbon-iron-oxidation etc. is also interesting.
He covers it a bit. Pretty interesting, you know how anime and stuff is all about the "steel folded a billion times" thing? it's because they had to use poor quality iron from sands instead of regular iron ore from rock like every other civilization. The folding was a way to remove impurities and make the iron usable for weapons and other tools
Pretty sure this is the article about it: :)
https://acoup.blog/2020/10/09/collections-iron-how-did-they-...