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. 2020 Sep 18;426:213544. doi: 10.1016/j.ccr.2020.213544

Fig. 46.

Fig. 46

Encryption using (a) a rubber stamp and (b) an ink pen and subsequent decryption of (i) pure NH2-MIL-125(Ti), (ii) with Pb2+ addition, and (iii) after EDTA addition, as observed in the UV − vis region (260–360 nm). Reprinted with permission from [405]. Copyright 2020 American Chemical Society.