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

Word History

Etymology

after E. Howard Farmer †1944 English photographic technician who originated it

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