I was under the impression the main reason to presoak is to remove the backside coating on most films. Some Kodak films have a heavy green antihalation coating. It seems to me to be a good idea to get rid of the stuff before it comes off in the developer, which it will certainly do. I don't care if it affects developing slightly or not, since I always do it and don't know the difference. I considering it as cleaning the loose layer off the film before processing.(posted 8851 days ago)