Secret Paper with Vinegar as an Invisible Security Ink and Fire as a Decryption Key for Information Protection

Published on Aug 14, 2019in Chemistry: A European Journal4.857
· DOI :10.1002/CHEM.201902093
Fei-Fei Chen14
Estimated H-index: 14
(CAS: Chinese Academy of Sciences),
Ying-Jie Zhu81
Estimated H-index: 81
(CAS: Chinese Academy of Sciences)
+ 3 AuthorsZhi-Chao Xiong13
Estimated H-index: 13
(CAS: Chinese Academy of Sciences)
: Security inks based on photoluminescent materials are mostly investigated for security applications, such as information encryption and decryption, anti-counterfeiting, and data storage. Although they are invisible to the naked eye under ambient light, they can be detected under ultraviolet or near-infrared light. Herein, a new kind of secret paper made from network-structured ultralong hydroxyapatite nanowires and cellulose fibers has been developed. White vinegar, a common cooking ingredient, is used as an invisible security ink. Covert information on the secret paper written with white vinegar is totally invisible under natural light, but it can be decrypted and clearly read after exposure to fire; the response time to fire is short (<10 s). The ways of writing on the secret paper are diverse by using various pens loaded with white vinegar.
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