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Photostability study. The residual RB in RB aqueous solution and RB-TF dispersion after 24 h of irradiation with visible light. The results represent the mean values of three independent experiments for each formulation (n = 3). Initial free RB amount vs free RB amount at 1, 2, 3, and 6 h: p value < 0.01(**); initial free RB amount vs free RB amount at 24 h: p value < 0.0001 (•••).
