in order to extend food preservation times. Researchers at the University of Strathclyde developed this bag into the market, the price will be very cheap. This bag can be a very clear signal to tell people when to start food deterioration, and may help people distinguish between "best before period" and "shelf life." In addition, it can remind people what needs to be done properly sealed food refrigerated storage. The research project leader Professor Andrew Mills said: "We throw away too much food, which is a kind of environmental and economic damage to this intelligent packaging is being more and more people use, inhibit the growth of bacteria. ., we are also trying