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. 2022 Nov 22;396(3):421–440. doi: 10.1007/s00210-022-02329-w

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Fig. 5 — A comparison of the colour intensity of the aqueous extract of Malva sylvestris before and after reducing the amount of silver nitrate (1 mM). The change in hue shows that Ag + has been reduced to an elemental nanosilver (Govindarajan et al. 2016)