Posterization in lith

I tried contact printing in lith last week. Aarons post about the positive paper got me thinking about darkroom effects and I figured I would put my own spin on a few. I took a few pictures during the process to explain exactly what I am doing. http://forums.photographyreview.com/...1&d=1210829519 I started with positives, until I had all the film registered. This shot shows that I am really just printing different density film.
http://forums.photographyreview.com/...1&d=1210829519

I exposed the first shot for 4 min., 60 sec., 45 sec., and 15 sec. I corrected my exposure to get the next two shots. I also took a positive out. http://forums.photographyreview.com/...1&d=1210829519
http://forums.photographyreview.com/...1&d=1210829519

http://forums.photographyreview.com/...1&d=1210829519

The blue spots on the first shot are from the scanner due to curl. The second shot was first, the third second and first last.

Between you and others I chat with, I'm dying to try some lith soon. I need to get another order together for supplies and think it might be time to pick some up.

Question on your process here, are those actual photo negatives you shot or are those printed onto transparencies?

Those are shots of lith film that I developed for this picture. You'll notice in both shots I have the negative on the pins first. The negative is the key to this shot. The positives I made are just different apertures. The negative I used was super light and had newer lith developer poured into it during the development process. The papers are Emaks, kentmere kentona, and Forte polywarmtone.