If your using 1:14 dilution, I'm guessing your using Ilfosol S. Is this right? If so, how long have you had the bottle and more importantly, what colour was/is the liquid in the bottle. If it's brown, it's probably gone off. Have you bought new stuff to try? I believe the edge markings give enough information to indicate major problems, and washed out ones indicate under development. Your 6 mins is the Ilford recommend time for Fp4+ in Ilfosol S, so I'm guessing the developer was off.(posted 8523 days ago)