Fiber laser and Norton White Tile permanent method. That’s a little too dark but it took all day and about 14 tiles to get here (from where I left off after giving up after several days). This is now the second type of laser that I can confirm needs a tighter focus to get NWT to work properly. I’m at 366mm on my 200mm lens when I’m normally at 372 mm for metals. 6 mm tighter focus. | Stephen Sink-Laser Fractals