Bromophenol Blue

4,4′-(3H-2,1-Benzoxathiol-3-ylidene) bis(2,6-dibromophenol) S,S-dioxide; C₁₉H₁₀Br₄O₅S = 670 (115-39-9)

Light orange-yellow powder, very slightly soluble in water, slightly soluble in ethanol (96%), freely soluble in solutions of alkali hydroxides.