This formula is recommended for those users of Ansco film who prefer pyro development. Stock solutions should be kept in stoppered bottles.
Solution1
| Sodium Bisulfite | 9.8 g |
| Pyro | 68 g |
| Potassium Bromide | 1.1 g |
| Water to make | 1 L |
Solution 2
| Sodium Sulfite, anhydrous | 105 g |
| Water to make | 1 L |
Solution 3
| Sodium Carbonate, monohydrated | 85 g |
| Water to make | 1 L |
TANK DEVELOPMENT: Take one part each Solutions 1, 2, 3 and add 11 parts water. Normal developing time, from 9 to 12 minutes at 68F (20C).
TRAY DEVELOPMENT: Take 1 part each Solutions 1, 2, 3 and add 7 parts water. Normal developing time, from 6 to 8 minutes at 68F (20C).
Solutions will keep well when stored separately but final developer should be used immediately after mixing.
From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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.