Figure represents an example of the difference in absorbance spectrums for methyl orange after 35 minutes in the presence of OHᐧ in a system with a pH of 3.0. Initially, the absorbance value at 472.2 nm is very high (0.870) and the peak is well defined. However, after 35 minutes, the absorbance value at this wavelength drops to a much lower value (0.055) and the peak is no longer discernible. The difference in absorbance values is consistent with the fact that hydroxyl radicals are reacting with the dye, thereby decreasing MO's concentration and observed absorbance. Furthermore, the creation of an unclear peak is due to the production of hydrocarbons and other side products (CO2, H2O) of the reaction. However, the small peak at 472.2 nm in the second graph demonstrates the presence of remaining methyl orange molecules.