Patches that change color as raw meat freshness deteriorates in sealed refrigerated products could soon become a reality on supermarket shelves, making it easier for shoppers to know if it’s still good to eat and reducing food waste. Patches that change color as raw meat freshness deteriorates in sealed refrigerated products could soon become a reality on supermarket shelves, making it easier for shoppers to know if it’s still good to eat and reducing food waste. Biotechnology Phys.org – latest science and technology news stories