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|
|Sodium Sulfite, anhydrous||45 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From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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.