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

Methyl Red
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Methyl Red CI 13020; 2-(4-dimethylaminophenylazo)benzoic acid; C15H15N3O2 = 269.3 (493-52-7)

Dark-red powder or violet crystals, practically insoluble in water, soluble in ethanol (96%).