General purpose film developer

Solution A
Water, 125F/52C	750 ml
p-Aminophenol Hydrochloride	100 g
Potassium Metabisulfite	300 g
Cold water to make	1L
Solution B
Cold Water	300 ml
Sodium Hydroxide	200 g
Cold water to make	1L

Mixing instructions: Add chemicals in specified sequence. Always use cold water when mixing sodium hydroxide due to risk of heat reaction. Unlike many other two part developers, you must mix both parts together to make the concentrated solution. In The Film Developing Cookbook, Troop and Anchell suggest the following sequence for making the concentrated developer: Allow Solution A to cool until a precipitate forms. Mix Solution A in an iced water bath at this stage, then slowly mix in Solution B while constantly stirring, first adding 280ml of solution B, and then adding the remainder until the solution suddenly turns dark. Follow this by adding the last drops of Solution B very slowly. Always wear gloves and protective goggles when mixing sodium hydroxide.

Dilution: 1+25, 1+50, 1+75, 1+100 and others.

Starting point development time: varies by dilution.

Note 1: This is the old formula for Rodinal and is not identical to the commercial version; however, practical use is very similar and starting point development times remain the same.

Note 2: Mixing this formula is recommended for experienced users only. If you would like to purchase a ready-made liquid version, we recommend Fomadon R09