Packaging tag signals spoilage; Chocolate-gobbling gut bacteria

Color-changing tag may signal foods’ freshness
A color-changing “smart” tag on food packaging could tell consumers whether a carton of milk has turned sour or a can of green beans has spoiled without opening the containers, according to researchers at the recent 247th National Meeting & Exposition of the American Chemical Society. “This tag, which has a gel-like consistency, is really inexpensive and safe, and can be widely programmed to mimic almost all ambient-tempe…