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Do you know the composition of the damascus? 15N20 and 1080+?
If the billet contains nickel (as in 15N20) use ferric chloride (usually available at Radio Shack for PCBs in 35% concentration). 4:1 water to etchant.
You have to start with the billet VERY clean. Use 409 or Windex. Then air dry it very well.
Then repeat the following process until the pattern is visible:
1. Hang in the etchant for 5 minutes. It should not be in contact with any surface in the
2. Neutralize the acid with windex or tri-sodium phosphate solution.
3. Scrub off the oxides with 2500 grit paper or #0000 steel wool.
I'm not really familiar with what to do with muriatic. I've heard 50/50 water to acid and 10:1 water to acid. Some people add hydrogen peroxide as a kicker to make it work faster (do not inhale this shit).
Hope that helps.
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