Which scientific innovation in retail smart labels can detect product freshness by changing color when exposed to certain gases released during food spoilage?

Science and technology have transformed retail in countless ways. One fascinating innovation is the development of smart labels, which combine chemistry, physics, and data science to enhance the shopping experience and supply chain management. This trivia question explores a cutting-edge advancement in this field that's changing how we interact with products and scientific information.

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Thermochromic indicators that only respond to temperature changes
RFID-enabled tags that transmit inventory data but cannot detect chemical changes
Gas-responsive nanoparticle sensors embedded in packaging that change color based on volatile compounds
Barcode-integrated humidity sensors that only detect moisture levels