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. 2020 Apr 14;11:1811. doi: 10.1038/s41467-020-15600-6

Fig. 5. Photographs of QR code based on wrinkled and fluorescent pattern for anticounterfeiting.

Fig. 5

a Initial labyrinth wrinkles and blue fluorescence. Scale bar is 2 mm. b QR code shaped wrinkled and blue fluorescent pattern obtained by a photomask of QR code under 450 nm light for 40 min; The corresponding LSCM images (right) exhibiting characteristic wrinkled and flat surface with or without minutiae, such as ridge ending (blue color) and bifurcation (red color). Scale bar is 50 μm. c Flat and QR code shaped purple fluorescent pattern that the sample b undergoing 56.4 ppm HCl for 5 min. d Flat and QR code shaped orange fluorescent pattern that the sample c undergoing 56.4 ppm HCl for 10 min. e Labyrinth wrinkled and QR code shaped blue fluorescent graphic images that the sample d undergoing thermal treatment.

HHS Vulnerability Disclosure