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Ansco 70 Hydroquinone Caustic Film Developer

FormulasThis developer is recommended for Process film used in reproduction work.


Solution 1

Hot Water (125F or 52C) 750 ml
Hydroquinone 25 g
Potassium Metabisulfite 25 g
Potassium Bromide 25 g
Water to make 1 L


Solution 2

Cold Water 1 L
Sodium Hydroxide (Caustic Soda Flakes)* 56 g


*Sodium Hydroxide may be substituted by Potassium Hydroxide – 50 g.


(Ed. Note – Sodium Hydroxide added to water gets hot. Using cold water is important, and use a container that can take heat – Pyrex is good. Be careful of any splatter.)


Mix equal parts of Solutions 1 and 2 immediately before use.

Develop films not longer than 3 minutes at 68F (20C).

From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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