Chinese researchers have developed a small tag that can indicate how fresh a perishable product is.

At the National Meeting & Exposition of the American Chemical Society, a report was presented on color-changing smart tags that indicate to consumers when food has spoiled. The jelly-like squares, developed by Chinese researchers, can be programmed for different products. One application could be informing people that their carton of milk has turned sour without them needing to open the container. The tags stick straight onto the packaging, and are color-coded to indicate the food’s freshness.

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