Figure 9

(a) Schematic illustration of different input anti-counterfeiting patterns developed on paper surface by following stamping method. UV 365 nm light was used as an excitation source to decode the patterns. The developed information was in situ photographed using a DSLR Canon EOS 100D camera; (b) photographs of the word “PRINCIPAL INVESTIGATOR IUAC (UGC)”, “PRINCIPAL INVESTIGATOR ISRO RESPOND” and “PRINCIPAL INVESTIGATOR Naval Research Board (DRDO)” stamped by using FDIP solution on paper and leather surfaces. Left panels were plane surfaces without any stamping under normal light. Middle panels of each photographs exhibit images in visible light after stamping. Right panels were corresponding photographic images of input patterns under UV 365 nm light; (c) fluorescence images on paper developed with various stamping time under UV 365 nm light irradiation; (d) images of anti-counterfeiting water-mark were developed using FDIP solution on the complex paper surface by stamped method.