Indirect cathodic reduction of dispersed CI Vat Blue 1 (indigo) by dihydroxy-9,10-anthraquinones in cyclic voltammetry experiments

► Soluble anthraquinones serve as mediators for dispersed indigo reduction. ► Cyclic voltammetry demonstrates indirect cathodic dyestuff reduction. ► Catalytic regeneration of the anthraquinone increases cathodic peak current