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

Litmus
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Litmus (1393-92-6)

Indigo-blue fragments prepared from various species of Rocella, Lecanora or other lichens, soluble in water, practically insoluble in ethanol (96%).

Colour change pH 5 (red) to pH 8 (blue).