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PHOTOCHEM Potassium Bromide per 250gm (05521-0250)
Potassium bromide (chemical formula: KBr) is a white, crystalline, water-soluble salt composed of potassium and bromide ions. It has been used in both medical and photographic applications since the 19th century. In photography, potassium bromide is used as a restrainer in black-and-white film and paper developers. Its main function is to slow down the development of unexposed silver halide crystals, helping to prevent fog and improve image clarity and contrast. By selectively inhibiting development in the highlights and shadow areas, potassium bromide allows for more controlled development, especially in fine-grain or high-contrast developer formulas. It is a key ingredient in many classic darkroom recipes, valued for producing clean, detailed negatives and prints.
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