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A. Dopamine (top) and 2,7‐DHN (down) coated PET. Half region of each PET film was soaked in the corresponding media for 10 s.
B. Colour value change of the coated PET films before and after the soaking. The colour value (ΔE) of PET film was calculated using the equation: ΔE = [(100 − L*)2 + (a*)2 + (b*)2]1/2.
