Colour-changing wrap could let you know when food has spoiled

A biodegradable plastic-like wrap made from silk changes colour when exposed to rotting foods and degrades quickly in soil

https://www.newscientist.com/article/2372373-colour-changing-wrap-could-let-you-know-when-food-has-spoiled/?fbclid=IwAR3Wqi_CsYRfG-tK-0uAU1Iv-bdOC5dVdDFLSPKTYWX-iC71JsuRRoRSq50

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