ahh good stuff. I like that look. I was actually just trying to figure out if that was Damascus, before I read your statement.Blackjack 1-7. It was too shiny for me so I steel wooled the stainless then did the old mustard on the blade trick and finished the blade with cold blue.
It looks a bit like Damascus to me, but I just wanted a dull finish regardless of appearance.
Interesting.... A mustard acid etch.
thanks for sharing.