science π§ͺ Smart packaging shows when your food is going bad π§ͺ
Researchers developed a flexible hydrogel film that changes color when food spoils, providing a visible freshness signal. This innovation, from Kyushu University, uses plant pigments embedded in a MOF structure to track pH changes. Tests with pork showed a consistent shift from purple-red to yellow-green as spoilage occurred. The material also self-heals, regaining 99% tensile strength within two hours after being damaged. They are now working on a smartphone app for real-time food quality checks.