This formula is recommended as a developer for Convira and Speedex papers when cold, blue-black tones are desired. ( Ed note – at posting, these papers are no longer manufactured. Modern papers are not generally responsive to tone from developers.)
| Hot Water (125 F or 52C) | 750 ml |
| Metol | 3.5 g |
| Sodium Sulfite, anhydrous | 45 g |
| Hydroquinone | 11.5 g |
| Sodium Carbonate, monohydrated | 78 g |
| Potassium Bromide | 1.2 g |
| Water to make | 1 L |
PAPER DEVELOPMENT: Dilute one part stock solution with 2 parts water, and sue at 68F (20C). For Speedex and Convira normal developing time is 45 seconds. Other contact papers may require 1 to 1 1/2 minutes.
From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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.
