date:Mar 26, 2014
of the American Chemical Society (ACS).
Consumers can find whether a carton of milk has turned sour or has spoiled without opening the containers with the colour code-based tag. The colours signify a range between 100% fresh and 100% spoiled.
If the tag is red or reddish-orange in colour, it means the food item is fresh. Over time, its colour changes to orange, yellow and finally green, which indicates that the food is spoiled. The tag is inexpensive and safe.
It could be widely programmed t