![]() With 100% accuracy, the AI model read the regular ink symbols as “STOP”, but when a UV light was shown on the writing, the invisible ink illustrated the desired message “BEGIN”. Finally, they tested the AI model’s ability to decode messages printed using a combination of both regular red ink and the UV fluorescent ink. Then, they taught an AI model, composed of multiple algorithms, to recognize symbols illuminated by UV light and decode them using a special codebook. The team loaded the solution into an ink cartridge and printed a series of simple symbols onto paper with an inkjet printer. 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. The process of oxidation occurs, turning the letters brown and revealing the message.“Paper Information Recording and Security Protection Using Invisible Ink and Artificial Intelligence”Ĭoded messages in invisible ink sound like something only found in espionage books, but in real life, they can have important security purposes. When heat is applied to these compounds, it breaks and releases the carbon, leaving it to come in contact with the air. So how does the invisible ink work? Well, lemon juice has carbon compounds and at room temperature, they do not have any color, therefore the ink is invisible. ![]() Use the source to heat the secret message before watching it appear. Possible heat sources include a hairdryer, an oven, or an iron. To make the message appear once the message is dry, a source of heat is needed. To write the message, the person must take their piece of paper and their writing tool and write their message before leaving it to dry completely. Once they have their invisible ink, it's time to write the message. First, they should cut the lemon in half and squeeze the juice out into a bowl or cup b before adding some water to the cup and mix. ![]() To make the ink, they would need a lemon, a bowl, water, a paintbrush or cotton swab, paper, and a source of heat. As it turns out, the average person may have all the ingredients needed to make their own invisible ink right in their own kitchen. (KERO) - People have seen it in spy movies, secret messages written through invisible ink. ![]()
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