I've done it immediately after taking my knife out of the tempering oven at 425+ degrees. You simply use a big brass brush and brush hard and fast and yes it will leave a thin coating of brass on the knife. Leave the torch alone you'll mess the temper of the blade that way, if you don't get it the first time put the blade right back in the oven for 10 mins and repeat. I use a big brush, not the toothbrush sized ones and you can do it in one shot.
This is all assuming you have put the final grind on the knife before final temper. I used O1 and two tempers.
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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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