FG7 is the ideal film developer for most darkroom situations. Most economical developer available - 1 oz. of FG7 can develop 2 rolls of film. With FG7, you have the option of many dilutions and methods of use for every continuous tone film. For example: diluted 1:15 for one-shot development, this compensating developer provides superior sharpness and grain; by adding a 9% solution of Edwal Sodium Sulfite, it gives finer grain on all films and FG7 offers various dilutions for rapid development of sheet films, roll films and push processing. FG7128 developer makes 16 gallons.