A good example of very effective design.
Japanese firm – To-Genkyo – has designed a new product label, which makes it extremely easy to tell if a product is fresh or not.
The hourglass shaped sticker/label contains a special ink that changes color based on the amount of ammonia emitted by the meat. Obviously, the older the meat, the more ammonia it releases, the darker the label gets at the bottom. If you’ll notice, the bar code is at the bottom of the hour glass, so once the meat is old, the bar code gets covered in ink and thus it cannot be scanned – meaning it cannot be sold.
Pretty Innovative. & Simple.
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