Before the development of a theoretical background and extensive support of the experimental data photochemistry was thought to be a flimsy subject, devoid of system with a number of processes involved and ill equipped with apparatus but the dawn of quantum mechanics and kinetics elucidate a vast field of research and since then photochemistry has played a vital role in chemistry. Thiazine dyes provide a vast field for the studies of photochemical kinetics in the presence of reductant. Methylene green is a member of thiazine dye which undergoes reduction by the visible light with reductant in...