• British Pharmacopoeia Volume V
  • Appendices
  • Appendix I A. General Reagents

Bromocresol Purple
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Bromocresol Purple 4,4′-(3H-2,1-Benzoxathiol-3-ylidene)bis(6-bromo-o-cresol) S,S-dioxide; C21H16Br2O5S = 540.2 (115-40-2)

Pinkish powder, practically insoluble in water, soluble in ethanol (96%) and in dilute solutions of alkali hydroxides.