The Tillmans technique of titration against the indicator 2: 6-dichlorophenol indophenol has been modified by Harris and Ray 1 for the estimation of ascorbic acid in trichloroacetic acid extracts ...

One of the best known methods based upon this property is the titration of ascorbic acid with 2: 6 dichlorphenol indophenol 1, after the removal of interfering substances with mercuric acetate.