PnP Blue
I have tried the PnP blue, which is supposedly the best material of its type. My results were not very good, but I attribute that to my technique and lack of experience -- the lines tended to smear out badly if I ironed it enough to get the whole toner area to stick. Maybe more practice would help, but it seems to me that it may be good for PC boards (where you only need to have defined traces and spaces, and the exact contour of the edges doesn't really matter) but not for detailed etching work. I did successfully use it for a couple of small single-sided PCB's, but after that trial have not experimented further. I have read reports that say 10 mil lines and spaces are possible on a PC board with practice.
