Used as a redox indicator in analytical chemistry, particularly in titrations involving oxidizing and reducing agents. The oxidized form is blue, and it changes to colorless upon reduction, depending on the oxidation state of the solution, making it useful for detecting the endpoint in redox titrations. Commonly applied in the determination of oxidizing substances like permanganate or dichromate in acidic media. Also employed in biochemical assays where monitoring electron transfer reactions is essential. Its sharp color transition enhances accuracy in visual detection of equivalence points.