How did he make that pattern?

He painted those flames on with a resistant, then etched the entire blade. Resistant covered areas remained "high" while the rest got etched away, leaving whatever he painted as a pattern.
 
I already had a suspicion, but I was hoping that it was not the case and that he had used some very nifty method of creating a Damascus pattern like that. That would have been really awesome. Ah well....

Cheers Rody
 
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