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PHOTOCHEM Potassium Persulphate 500gm (05509-0500)
Potassium persulphate (also spelled potassium peroxydisulfate, chemical formula: K₂S₂O₈) is a white, crystalline, water-soluble compound known for its strong oxidizing properties. It is often used in polymer chemistry, etching, and as a bleaching agent. In photography, potassium persulphate is used as a bleaching agent in various toning and intensification processes. It works by oxidizing metallic silver back into silver halide, which can then be re-developed or toned to alter the image’s appearance, density, or color. This chemical is especially useful in intensifying weak negatives or in preparing images for alternative toning, such as sepia or copper toning. It is appreciated in darkroom work for its precise and controllable bleaching action, though it must be handled carefully due to its reactive nature.
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