Fig. 7: Images of samples under visible and UV light (365, 312, and 254 nm).

(a) Plain OCP (CONTROL), (b) pyromellitic acid, and (c) OCP with incorporated pyromellitate ions (Pyro5_pH6.0).

(a) Plain OCP (CONTROL), (b) pyromellitic acid, and (c) OCP with incorporated pyromellitate ions (Pyro5_pH6.0).