I’ve been trying to engrave the backs of mirrors. I’ve been using some of the 6 pack 12x12 1/8" thick mirrors from Lowe’s. I was curious if you will always get the frosted look on the front when you engrave the back coating off? I ran a material test on one of the mirrors on my 50W OMTech laser. I either don’t get all of the coating off the back or it’s off and get the frosted look. I just didn’t know if that was the only option or if you could get off the backing and have a smooth look. Thanks for the feedback. Here’s my test mirror for reference. I ran the rectangles with a min power of 0%, max power of 70% and then power scales to give me 5%-65%. With a 0.07 line interval and 1 pass each.