Fig. 4From: Glutathione-capped Syzygium cumini carbon dot-amalgamated agarose hydrogel film for naked-eye detection of heavy metal ionsPhotographic images of bare agarose hydrogel and GSH CD-agarose hydrogel film for visual detection of metal ions (Pb2+, Fe3+, Mn2+, Cr3+, Hg2+, Cu2+, Cd2+, and Co2+ ions, 1.0 mM)Back to article page