Groceries may now want to invest inthis new sticker technology that helps consumers determine the ripe from the .. err ugly.Named the RediRipe stickers, each one is stuck on a fruit, and it detects the ethylene gas that is released by fruits when they ripen. The sticker changes color from white to blue, and the darker the blue, the riper the fruit. But the color shift is not instantaneous, taking about 24 to 48 hours. (source)
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