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This is 100g of Potassium Bromide from Photographers' Formulary. It is commonly used as a restrainer in developers, especially those containing hydroquinone, pyrocatechin, or pyrogallol, and helps to prevent fog during development. When used in paper developers, it also reduces contrast and provides a warming effect. Additionally, potassium bromide is used as an ingredient in intensifying and reducing toners, as well as a variety of other photographic solutions.
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Bromide Bromide of potash Bromide of potassium Bromide salt of potassium
White, deliquescent, granular powder Odorless
Fog preventer and restrainer in developing solutions Ingredient in intensifying, reducing, toning, and many other photographic solutions
Potassium bromide is the most commonly used restrainer in developing formulas, especially those using hydroquinone, pyrocatechin, or pyrogallol. The addition of potassium bromide usually results in a reduction of contrast and can have a warming effect on image tone when used in paper developers