I did a small 5 x 7 inch dry point on plexi-glass yesterday. (I needed one for a demo I'll be doing in a week or so.) I haven't printed it yet, but here is what the plexi plate looks like. It's sort of a negative of what the print will look like - since anything white will hold ink and print black & the clear parts (which look black due to the black behind it here) will be white. The lines were scratched in with an etching needle & the cloudy parts were due to sandpaper.