The rate constant of malachite green (MG + ) alkaline fading was measured in waterethanol-2-propanol ternary mixtures. This reaction was studied under pseudo-first-order conditions at 283-303 K. It was observed that the observed reaction rate constants, k obs , were increased in the presence of different weight percentages of ethanol and 2-propanol. The fundamental rate constants of MG + fading in these solutions were obtained by using the SESMOR-TAC model. In each series of experiments, the concentration of one alcohol was kept constant and the concentration of the second one was changed. It was observed that at the constant concentration of one alcohol and variable concentrations of the second one, with an increase in temperature, k 2 values decrease according to the trend of hydroxide ion nucleophilic parameter values and k 1 values increase. C