Hey all! Back for some more advice. I cut some Proofgrade acrylic, and on the Medium Red and Medium Yellow, you can see black scorch marks in the corners of sharp angles, and in the text. I can’t seem to get it out. I started with warm soapy water in my ultrasonic cleaner, giving them a good 5-7 minutes in the bath, then scrubbing them with a toothbrush. No dice. I then tried out some 91% isopropyl alcohol since I remembered some folks talking about using that. Still nothing. At this point I’m not sure what chemical to throw at the problem, or maybe it’s soot that’s now fused with the acrylic and no scrubbing will get it out? I wonder if I need to adjust my process to prevent it in the first place. I had the backing on the front and back, and a thin piece of card under it to prevent melting around the text.
Have any of you seen this? What steps might I test to resolve it?