As can be seen in the figure, the measured anatase and rutile signals of the coated and lasered samples decrease with an increasing number of coating and laser cycles. This indicates that the laser process removes material from the coating, causing the signals to weaken. This observation is confirmed by the results of the reactivity tests, such as the decolorization of methylene blue (vide infra). At a laser intensity of 7%, the decolorization rate of methylene blue was found to decrease with each subsequent coating and laser cycle. At a laser intensity of 8%, the decolorization rate of methylene blue was already significantly lower after the first laser than after three coating and laser cycles at 7%. This suggests that the higher intensity of 8% leads to greater removal of the coating, which further reduces reactivity. Overall, the degradation rate of methylene blue was generally lower at 8% laser intensity than at 7%. This result is clearly shown in Figure of the SI. Furthermore, these observations are consistent with the results of the nitrobenzene reduction experiments (see Figure in the SI), which also serve as a reactivity test. The transmission measurements also support these findings, as can be seen in Figure photocatalyst and then dried in an oven at 80 °C. They were then laser-annealed at a laser intensity of 7% or 8%. The process -coating, drying and laser-annealing -was repeated up to three times. The plate that was not laser-treated was coated once.