Restrainer - chemical constituent of developing solutions which helps prevent reducing agents from affecting unexposed halides and converting them to black metallic silver.
The restrainer in a developing solution serves what purpose? 1. It slows down the action of the reducing agent 2. It prevents the preservative from etching the silver grains 3. It reduces image contrast 4.
RestrainerA restrainer is added to prevent the developer and the accelerator from working so quickly as to cause chemical fogging, or reduction of un- or underexposed silver halides. Simultaneously the restrainer helps control excessive contrast.
Potassium bromide
A chemical used as a restrainer in most developing solutions and as a rehalogenizing agent in bleaches.
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 See also: Emulsion, Processing, Film, Developer, Development
  
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