The Ilford Simplicity Film Kit contains chemistry to develop 120 and 35mm film rolls. It includes 60mL Sachet of Simplicity film developer that creates a 600mL developing solution when mixed with 570 mL of water. It can be used to develop a single 120 roll or two 35mm film cartridges. The developer provides fine grain and sharpness in the photograph. You can use the Simplicity stop bath to halt the further development of the film, thus extending the life of the fixer solution. The Simplicity film fixer has a rapid-acting nature that needs to be kept apart from hardeners. Use the Simplicity wetting agent to prevent water spots formation and eliminates static qualities of the film.