Le concept n’est pas nouveau (ici, ici et là), mais l’idée de lui faire prendre la forme d’un sablier est originale.
The Asian designer Naoki Hirota found an effective solution how to insure customers of buying spoilt food in supermrkets. He designed a special fresh label which changes its colour depending on expiry date.
Once the meat (or other perishable product) is past it’s due, the label will have turned from white to blue, making the item unscannable. The label has one layer of info for the food with the barcode, and another on top with special ink reactive to ammonia.
The ink is made of non-toxic, safe pigment of purple cabbages.
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