Potassium iodide, 99.0+%

KI is a precursor to silver iodide (AgI) an important chemical in film photography. KI is a component in some disinfectants and hair treatment chemicals. KI is also used as a fluorescence quenching  agent in biomedical research, an application that takes advantage of collisional quenching of fluorescent substances by the iodide ion. Potassium iodide is a component in the electrolyte of dye sensitized solar cells (DSSC) along with iodine.

Potassium iodine finds its most important applications in organic synthesis mainly in the preparation of aryl iodides in the Sandmeyer reaction, starting from from aryl amines. Aryl iodides are in turn used to attach aryl groups to other organics by nucleophilic substitution, with iodide ion as the leaving group.

The major uses of KI include use as a nutritional supplement in animal feeds and also the human diet. For the latter, it is the most common additive used to "iodize" table salt (a public health measure to prevent iodine deficiency in populations which get little seafood).