The Ilford Simplicity Film Multi Stop is used during the developing process of 120 and 35mm film rolls. In the pack, you get a total of 5 sachets; each of them contains 30 mL of chemistry. It helps you to stop further developing of the photographs in the tray. With 30 mL of chemistry, you get a working solution of 600 mL. The multi stop batch exudes a mild odor. Its citric base helps you to increase the shelf-life of the fixture solution.