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Potassium iodide is a simple iodide salt utilized as a fluorescence quenching agent which acts by collision quenching of fluorescent substances by the iodide ion. It is also used in the isolation of single stranded DNA.
Flowers S.; Biswas EE.; Biswas SB. Conformational dynamics of DnaB helicase upon DNA and nucleotide binding: analysis by intrinsic tryptophan fluorescence quenching. Biochemistry. 2003, 42 (7), 1910-21.
Alfred Weissler.; Herbert W. Cooper.; Stuart Snyder. Chemical Effect of Ultrasonic Waves: Oxidation of Potassium Iodide Solution by Carbon Tetrachloride. J. Am. Chem. Soc. 1950, 72 (4), 1769-1775.