CAS Registry Number

CAS 4430-25-5 — Tetrabromophenol blue

Tetrabromophenol blue is a brominated phenolic dye used primarily as a pH indicator in biochemical assays, particularly in protein gel electrophoresis and titration applications. It changes color from yellow to blue around pH 6.0–7.6, making it useful for detecting shifts in acidity. This chemical has a CAS number of 4430-25-5, a molecular formula of C19H6Br8O5S, and a molecular weight of 985.54 g/mol. It is stored at ambient conditions with a signal word of *Warning* for safety. Molekula supplies Tetrabromophenol blue from research to bulk quantities with full documentation and ISO 9001:2015 traceability.