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Absorption spectral evolution from 0 min (a) to 6 h (g) observed for an aqueous solution of PolyCD (2 mg mL−1) containing PSE (4.5 mg mL−1) in the presence of HAuCl4 (0.4 mM). The inset shows the actual image of the sample a and g, respectively. T = 25 °C.
