Proportional reducer - chemical method of reducing excess density and contrast from a photographic negative.
Potassium persulfate
A chemical sometimes used in super proportional reducers.
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More Photographic Terms ...
-Ammonium persulfate - chemical used in super-proportional reducers.
-Ammonium sulfide - pungent but essential chemical in sulfide or sepia toning.
 See also: Reducer, Reducers, Overexpose, Space, Opaque
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