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Color-coded tags may signal food’s freshness Scientists have now come up with a color-coded smart tag that can tell consumers whether a carton of milk has turned sour. This technology could also tell you if a can of green beans has spoiled, all without opening the containers. “This tag, which has a gel-like consistency, is really inexpensive and safe, and can be widely programmed to mimic almost all ambient-temperature deterioration processes in foods,” said lead researcher Chao Zhang, who i...
