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.