I've always had good luck etching Devin's stainless Damascus in a 3 - 1 mix of Ferric Chloride and distilled water. I etch 3 times for 5 - 10 minutes each time, scrubbing with a toothbrush and soap and water between each etch. The first etch doesn't seem to do much, and you'll think it's not going to work right - but keep going for three etches, and it will look good.
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