Breathing on this chip reveals a secret message
Engineers at UC San Diego have created a humidity-sensitive image encoder that reveals hidden messages when humidity exceeds 60 percent. This postage stamp-sized chip can also be used for security codes on credit cards and to indicate climate changes. The technology utilizes two hydrogel layers that change visibility based on moisture levels.
- ▪The chip reveals a hidden message when humidity levels surpass 60 percent.
- ▪It can also display security codes for credit cards and indicate climate changes.
- ▪The encoder consists of two hydrogel layers that react to humidity changes.
Opening excerpt (first ~120 words) tap to expand
The encoder could also be used to reveal a security code on a credit card. Image: NDAO Lab Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. Email address Sign up Thank you! By signing up, you confirm you are 16+, will receive newsletters and promotional content and agree to our Terms of Use and acknowledge the data practices in our Privacy Policy. You may unsubscribe at any time. A team of engineers at the University of California San Diego (UCSD) have developed a humidity-based image encoder that looks straight out of James Bond’s Q-Lab. The postage stamp-sized chip can store a hidden message that is only revealed when exterior humidity levels surpass 60 percent. The image can then be concealed again by bringing humidity back down.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Popular Science.
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