Many attempts have been taken to investigate the electrochemical behavior of MB molecules in the aqueous medium using various electrodes such as mercury [15], [16], [17], [18], [19] and [20], platinum [21], gold [22] and graphite [23]. It is well known that organic compound degradation in aqueous media through electrochemical oxidation processes depends on several influential factors such as, pH, temperature, electrolyte concentration and electric current density. The objective of this study is to examine the effect of applied potential on bleaching/decolorization of MB+ at an ordinary polycrystalline Pt electrode in the presence of KCl supporting electrolyte.