Ilford Ilfosol 3 black and white film developer is an enhanced formulation of the one-shot, general-purpose, liquid black and white film developer - Ilfosol S. Ilfosol 3 developer is particularly suited for use with medium and slow speed films such as Pan F Plus, FP4 Plus and Delta 100 Professional where it ensures a fine grain and optimal sharpness at full film speed. It is supplied as a concentrate in economical 500ml bottles and is diluted (typically at a ratio of 1:9) for one-shot use. However, for greater economy, Ilfosol 3 can also be used with many films at a higher dilution of 1:14 with only a small trade off in image quality.