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SEM images of gold leaf before (a–c) and after (d–f) dissolution in [C2MIM][OCN] (d), [C3MIM][OCN] (e) and [C4MIM][OCN] (f) mixed with water (10 wt. %) for 24 h at 40 °C. The scale bar for all micrographs is 5 μm. The typical dissolved areas were labeled by red dash rectangles.
