Figure 1.

Visual appearance of vials containing the Rumex hymenosepalus extract and AgNO3 solution after different reaction times. The vials correspond to different AgNO3 concentrations: (a) pure extract, (b) 2.5 mM, (c) 5 mM, (d) 7.5 mM, (e) 10 mM, and (f) 15 mM. The change in color is an indication of the growth of silver nanoparticles.

Rodríguez-León et al. Nanoscale Research Letters 2013 8:318   doi:10.1186/1556-276X-8-318
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