2,6-Dichlorophenolindophenol Sodium Salt

The sodium derivative of 2,6-dichloro-N-(4-hydroxyphenyl)-1,4-benzoquinone monoimine; Tillman’s reagent; C₁₂H₆Cl₂NNaO₂, 2H₂0 = 236.1 (620-45-1)

Dark-green powder, freely soluble in water and in anhydrous ethanol. The aqueous solution is dark blue; when acidified it becomes pink.