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Ansco 64 Rapid Metol Hydroquinone Tropical Film Developer

FormulasThis is a clean-working developer of particular value for rapid development or development at high temperatures.


Hot Water (125F or 52C) 750 ml
Metol 2.5 g
Sodium Sulfite, anhydrous 25 g
Hydroquinone 6.5 g
Sodium Carbonate, monohydrated 16 g
Potassium Bromide 1 g
Water to make 1 L


Do not dilute for use.


Normal developing time – 3 to 4 minutes at 68F (20C).


For development at temperatures higher than 68F, see paragraph on time-temperature coefficients.

From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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