This is a standard formula recommended for development of Reprolith and Reprolith Ortho Films.
| Water (Not over 90F or 32C) | 2 L |
| Sodium Sulfite, anhydrous | 120 g |
| Paraformaldehyde | 30 g |
| Potassium Metabisulfite | 10.5 g |
| Boric Acid Crystals | 30 g |
| Hydroquinone | 90 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From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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.
