John Seim taught color case hardening for two summers at Trinidad State's NRA Summer Gunsmithing Program. He has a book released on that topic and should be on Amazon by late Sept. early Oct..
I don't recall reading about cyanide in it. It does cover bone only, charcoal, leather and different types of wood charcoal. He experimented with all types of combinations.
You need a furnace and that will suck up a lot of energy. Remember, back in the olde days of America, it was done in the backyard. Amazon will restock.
With knife makers/blacksmiths becoming so prolific one may be able to find one in ones own town or city. For a fee they might provide the controlled heat necessary.
On second thought would be a darn good excuse to buy a custom knife.
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