Indigotindisulfonate Sodium

FD&C Blue No. 2; Indigo Blue; Indigo Disulfonate; Blue, Indigo; Blue, Soluble Indigo; Disulfonate, Indigo; Indigo Blue, Soluble
An indolesulfonic acid that is used as a dye in renal function testing and as a reagent for the detection of nitrates and chlorates and in the testing of milk.