The spectroscopy of ferric thiocyanate served as a viable method of detection of ideal conditions for the Fenton processes. The oxidation of iron(II) to iron(III) was easily measured by adding in KSCN, to form ferric thiocyanate, a bright red molecule whose formation has a very high rate constant . Due to the rapid formation of this complex, the concentration of Fe 3+ produced from the Fenton reaction is able to be measured immediately through the use of the Vernier Spectrophotometer. However, to determine the conditions in which the most hydroxyl radicals produced, the second method of measuring the degradation of methyl orange was more effective. The organic dye was able to quickly degrade in the presence of these radicals in a time span of 35 minutes and the dye's bright orange color allowed for the use of visible light spectroscopy to measure degradation.