|Water (Not over 90F or 32C)||2 L|
|Sodium Sulfite, anhydrous||120 g|
|Potassium Metabisulfite||10.5 g|
|Boric Acid Crystals||30 g|
|Potassium Bromide||6 g|
|Water to make||4 L|
Dissolve chemicals in the order given and use solution full strength. Normal developing time 2 to 3 minutes at 68 to 70F (20 to 21C). For Reprolith Orthochromatic, develop 1 1/2 to 3 minutes at same temperature.
From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference. They may not work well with modern films and papers. Some of the chemicals can be dangerous. As with all photographic processes, be careful.