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With the raise of living standards, increasingly focus has been attached to food-security. The concept of color-security based upon changes in color caused by higher temperatures. Take the packet of yoghurt for instance, while the external temperature above yoghurts storage temperature there will be a gradual color variation, to be more specific, from gray to pale red and then to red. If the gray part totally changed into red one it conveys the information of food spoilage.