Rollei has re-designed the idea of color chemistry and the result is a user-friendly, more stable, improved Rollei C-41 kit for self processing of color negatives films in a home darkroom. This more stable formula allows for processing at three (3) different temperatures. The Rollei C-41 Developing Kit - 1 Liter has been designed especially for beginners to facilitate self processing of color negative films and contain all the chemicals needed to processing your color negative film.