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If you leave the O1 just sitting in the coal forge for 10 minutes it will almost certainly overheat unless you can somehow magically guarantee that the temp will sit solidly at 1475F. That's why we say that O1 cannot be properly heat treated in a forge. That won't stop you from making a serviceable knife but it won't be quite as good as it could be.
As for that true north stuff, I would put that in the same category as the old myth about edge packing...
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