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Ansco 311 Flattening Photographic Reducer

FormulasThis reducer is useful for lessening the density and contrast of heavy negatives.


Solution 1

Ferricyanide 35 g
Potassium Bromide 10 g
Water to make 1 L


Bleach in Solution 1 and after through washing, redevelop to desired density and contrast in Ansco 47 or other negative developer except fine-grain developers. Then fix and wash in usual manner. Conduct operation in subdued light.


From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference.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