I experimented with 35mm kodalith about 15 years ago. It is very high contrast and was a pain to work with. The EI was about 3, so you pretty much have to use a tripod for most work. After going thourgh the 100 foot roll, I concluded that Kodak Tech Pan was the way to go for 16x20's from 35mm. I only got one usable negative from the whole 100 foot roll of kodalith. Have fun with experimenting, but don't use it for anything that you want to save. About the only use I found for it was doing lens resolution tests.(posted 8245 days ago)Developers that I tried were, Technidol, Ethol TEC, Diafine, and a couple others I don't remember.