The Fenton reaction is of great interest due the production of hydroxyl radicals, a highly reactive species. Under exposure to radiation, hydrogen peroxide in biological systems can form radicals by reaction with Fe 2+ ions. In this experiment and previous research, it was determined that this reaction is ideal under acidic conditions (pH of 2-4) but still occurs to some extent under physiological conditions. It was also determined that visible light spectroscopy of ferric thiocyanate and methyl orange serves as a viable method for determining the extent of the Fenton reaction and activity of its products. The degradation of methyl orange served as a more effective method of radical detection while the ferric thiocyanate method proved to have broader applicability in the kinetic study of the reaction. Understanding methods of production for these hydroxyl radicals is pivotal due to the numerous potential applications of these reactive radicals for research purposes in the fields of cancer and wastewater treatment.