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

Bromothymol Blue
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Bromothymol Blue 4,4′-(3H-2,1-Benzoxathiol-3-ylidene)bis(2-bromothymol) S,S-dioxide; C27H28Br2O5S  =  624 (76-59-5)

Produces a yellow colour in weakly acidic solutions and a blue colour in weakly alkaline solutions. Neutrality is indicated by a green colour.