Food waste is a major problem and expiration date confusion is one of the contributing factors. At a meeting of the American Chemical Society one scientist introduced smart-tags which could indicate whether food is fresh or spoiled. This innovation could alleviate some of the expiration date confusion and subsequent food waste. My only concern is that red means “fresh” and green means “spoiled”.
For the full story, please see “Knowing whether food has spoiled without even opening the container” http://www.acs.org/content/acs/en/pressroom/newsreleases/2014/march/knowing-whether-food-has-spoiled-without-even-opening-the-container-video.html
For more on food waste and stability studies, see previous blog: Stability Studies – Food Scientist Life and Food Business News article “Expiration harmonization sought”