British Pharmacopoeia Volume V
Appendices
Appendix I A. General Reagents

2,6-Dichlorophenolindophenol Sodium Salt

2,6-Dichlorophenolindophenol Sodium Salt The sodium salt of 2,6-dichloro-N-(4-hydroxyphenyl)-1,4- benzoquinone monoimine; Tillman's reagent; C₁₂H₆Cl₂NNaO₂ + aq (620-45-1)

Analytical reagent grade of commerce.

A dark green powder. Aqueous solutions are dark blue, becoming pink when acidified.