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I read some spec sheets about cryoing a blade and it definitely talked about Ray's slow intro to LN. I used dry ice as well and a slow intro is called for there. Dry ice is best for a metal like AEB-l which calls for it, but it will work some toughness into other steels if that's all you have.
Heat treating is such a fascinating subject and I have learned much from many contributors here.
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Now it says Guru and it used to say Master. I think I like Master better, though skilled would be the best description
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