# Farmer's reducer

> English word · Noun

## Definitions
1. A mixture of sodium thiosulfate with the bleaching agent potassium ferricyanide, used to reduce the density of a negative or gelatin silver print.

## Etymology
Named after Howard Farmer.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/farmer-s-reducer