ILFORD SIMPLICITY Film Fixer is a non-hardening photo chemical which permanently fixes the development of film when used as part of a standard dev, stop, fix and wash film development process.Suitable for all black & white films, the SIMPLICITY Film Fixer comes in an easy to use sachet containing the correct amount of liquid concentrate to develop 2 rolls of 35mm (135) film or 1 roll of 120 film when using a 2-reel, 600ml developing tank at a dilution of 1+5.