Specification Product Name BROMOPHENOL BLUE Synonyms Tetrabromophenoltetrabromosulfonenephthalein, CAS NO. 115-39-9 Molecular Formula C19H10Br4O5S Molecular Weight 669.98 Appearance Peach-Powder Structure     Tests    Limits Transition Range - pH 5.2 – pH 6.8 Greenish Yellow – Purple Solubility 0.1% (EtOH) Clear golden yellow Solution Absorptivity 1%, 1cm (pH 3.0) at λ max.436.0nm (pH 4.6) at λ max.591.0nm - 350-385 - 940-1000 Loss On Drying (110°C) 1hr. - 1%         REVISED: 1-1-2012