We used Speed Ball water based block printing ink. There are some really interesting possibilities with mold making for sure. I've been wanting to to carve wood blocks and try Japanese wood block printing. Before I bought your software, I had been using Halftoner, which works pretty good, but is pretty limited. I love half tones, but the biggest challenge I have is after the carve. I always fuck it up when I try to fill in the marks with paint, and then paint the surface, or vice versa. One of the things I love about your software is the ability to stack tool paths. The combination of the Conformal path with the Spiral or Parallel looks awesome! I will experiment with that next week.