The alkaline fading of crystal violet (CV) is accelerated by using AOT micelles formed in supercritical ethane as a continuous phase. The rate of fading can be promoted by over two orders of magnitude by controlling operating pressure and molar ratio of water to AOT(W). The structure of AOT molecules, the type of interior water molecules, and the E-T(30) value indicative of micropolarity of a dye-organized cybotactic region in the micelle core seem to account for the rate enhancement with an increase in the W. It is further suggested that a decrease in the size of the micelle core due to significant changes in the intermicellar and AOT-ethane interactions with increasing pressure, which causes an increase in the micropolarity inside the core, is of importance for the promotion effect by pressure.