A simple yet brilliant sensor made with dye‑coated silica squares changes color upon exposure to 12 toxic gases, identifying them with 99% accuracy in just five minutes. It’s low‑cost, durable, and humidity‑proof—a practical breakthrough for environmental safety. 
(c) Max Muselmann/Unspaolsh CC0

Color‑Changing Paper Sensor Flags Poisonous Gases Instantly

PHYS

A simple yet brilliant sensor made with dye‑coated silica squares changes color upon exposure to 12 toxic gases, identifying them with 99% accuracy in just five minutes. It’s low‑cost, durable, and humidity‑proof—a practical breakthrough for environmental safety. 

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