Check out these color changing barcodes  designed by TO-GENKYO.

Food packaging labels that change color as the expire date approaches.

Over the last year or so Japan had been struck by a number of scandals involving food companies tampering with expiration dates.The labels use a special ink that changes color as ammonia is released inside the package.As the meat ages, it releases increasing amounts of the substance, obscuring the barcode at the bottom. Customers can quickly see if the meat is going bad – and when the barcode becomes completely covered, it can’t be scanned.