I recently come upon some vnf-1 films 7239 and 7240. Yes I know they are no longer in production. Maybe PE or someone in the know could explain to me the main differences between these VNF-1 films and E6 films. I have scratch made chemicals that are very similar to what VNF-1 needs and I am using the correct development times but keep coming up with near clear film. I did try E6 timing also. I actually tried some E6 film in these chemicals and came up with quite usable images. Using E6 times of course. Maybe the films are just too old?