It’s possible that they are using inks and wavelengths of light that are made for each other. As in, they’re cheating, the laser comes in and neutralizes the color of the ink. This is all theoretical, but I don’t see why it isn’t feasible.
Thanks, I had not found that post. That’s exactly the affect and actually I was using about the same settings, but my results are just brown, singed. Must be differences in the material somehow…