I have been contact printing 8x10 negs on lupex lately but I hadn’t considered it for lith. Are Silver Chloride emulsions known to lith? Coincidentally I contact lithed several sheets old Kodak Ektalure a couple weeks ago. For whatever reason it yielded a very black and white lith with very little color. Not sure why contact printing lith would be any different than the normal way since I get lots of beautiful colors with the same stock using an enlarger…
Just now realized this is an old thread. Maybe the OP will still see this….