To demonstrate the reversibility of this redox process in water, alternating potentials of 0.0 V and 1.0 V were applied with time intervals of 3 sec. while simultaneously montoring the optical absorbance of the MA at λmax = 575 nm. These SEC measurements show that the maximum ΔT% of ∼52% is achieved in ∼0.9 s with ≥ 97% retention of the initial ΔT% for at least 1500 cycles (Figure ). The coloration efficiency is estimated to be ~155 cm 2 /C. Importantly, the electrochromic properties of such assemblies are not affected by the use of aqueous electrolyte solutions.