Photographers' Formulary Film Developer 23 (4 L)

This metol-based, semi-compensating film developer is similar to Kodak D-23 and produces negatives with low to medium contrast. Four rolls of film can be processed in one liter of Formulary without replenishment. With replenishment, a total of 20 to 25 rolls of film per liter can be developed. Chemicals in this kit are used solution-size with a shelf life of six months.