Researchers have developed a new technique that can pinpoint, in real-time, the moment at which milk spoils inside a carton. In their new study, published in the journal Food Control, they suggest that if their invention is integrated into the caps of milk containers, it could one day replace less-accurate sell-by-dates – and save a huge quantity of milk from being wasted every year.

Milk goes off because of microbial growth that occurs over time, emitting increasing amounts of volatile organic compounds (VOCs) – such as aldehydes and ketones – that change the liquid’s flavor and smell.  The researchers’ invention is…

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