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Ansco 103 Paper Developer

FormulasThis 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From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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.