Color-changing mood rings, forehead fever strips and car-shade indicators all change hues as they warm and cool, thanks to a phenomenon called thermochromism. On a smaller scale, thermochromism is used in nanotechnologies like sensors, electronics and computing. These applications require smart...

Source: [Phys.org](https://phys.org/news/2026-06-uv-patterns-thermochromic-crystals.html)

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