Farmer's reducer
noun
Far·mer's reducer
ˈfärmərz-,
ˈfȧməz-
: a 20 to 25 percent solution of hypo to which a few drops of a 10 percent solution of potassium ferricyanide are added and which is used for reducing the image density and fog density of photographic negatives and prints
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Merriam-Webster unabridged
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