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a chemical, such as ammonium thiosulfate, used in the processing of exposed x-ray film to remove unexposed and undeveloped silver halides from the emulsion.
1. A substance that increases the transparency of tissues prepared for microscopic examination.
2. In radiographic film processing, the active agent in the fixer that clears undeveloped silver bromide crystals from the film. The most common agent is ammonium thiosulfate. Synonym: fixing agent
See also: agent
added to skin scrapings to digest keratin and permit better visualization of ectoparasites or fungal hyphae and spores. Potassium hydroxide is used most commonly.
in radiographic processing is the time required for the fixative to dissolve away the 'milkiness' of developed halides on the film.