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

Methylene Blue
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Methylene Blue CI 52015; basic blue 9; C16H18ClN3S,xH2O  =  319.9 (anhydrous) (7220-79-3)

Use a redox indicator grade suitable for biological work.

A hygroscopic, dark green or brown, crystalline powder.