I can't get decent looking tones out of my Arches Platine. It looks like a VanDyke brown with some serious bronzing on my test strips, but no good middle tones or blacks. Just for comparison, I coated some cheap Arches Paper (the one with the infinity or sideways 8 on it) and got much better looking results. I'm humidifying to 55%RH and coating in about 70 degrees. Exposing on a custom UV unit.