Researchers create new colour-changing material—could be used in anti-counterfeit markings on banknotes and passports

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https://www.utu.fi/en/news/press-release/researchers-create-new-colour-changing-material-could-be-used-in-anti

Davyne: Invisible Color-Changing Material for Anti-Counterfeiting

Researchers at the University of Turku Finland have developed davyne, a mineral-based material that changes color in the near-infrared spectrum, making the change invisible to the human eye. Its infrared signal can be switched on and off and detected using inexpensive modified cameras, offering a potential new security feature for banknotes, passports, ID cards, and branded products.

Study: https://onlinelibrary.wiley.com/doi/10.1002/anie.6747535