![]() The researchers made carbon nanoparticles from citric acid and cysteine, which they diluted with water to create an invisible ink that appeared blue when exposed to UV light. So, Weiwei Zhao, Kang Li, Jie Xu and colleagues wanted to train an AI model to identify and decrypt symbols printed in a fluorescent carbon nanoparticle ink, revealing hidden messages when exposed to UV light. In addition, advances in artificial intelligence (AI) models - made by networks of processing algorithms that learn how to handle complex information - can ensure that messages are only decipherable on properly trained computers. ![]() Carbon nanoparticles, which have low toxicity, can be essentially invisible under ambient lighting but can create vibrant images when exposed to ultraviolet (UV) light – a modern take on invisible ink. Invisible ink can hide classified economic, commercial or military information from prying eyes, but many popular inks contain toxic compounds or can be seen with predictable methods, such as light, heat or chemicals. ![]() Now, researchers reporting in ACS Applied Materials & Interfaces have printed complexly encoded data with normal ink and a carbon nanoparticle-based invisible ink, requiring both UV light and a computer that has been taught the code to reveal the correct messages.Įven as electronic records advance, paper is still a common way to preserve data. Yet, they can be cracked if their encryption is predictable. Coded messages in invisible ink sound like something only found in espionage books, but in real life, they can have important security purposes. ![]()
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