Is Fresh? / sticker

Is Fresh?
People tend to buy lots of food in the refrigerator, it is easy to caused the food deterioration or corruption.
Especially we rarely to check the food's expiration date, rotten food will make our sick.

By use this "flash stickers" can help us know the status of food, sticker's color change from bright green to red, warning people need to deteriorate the food has been consumed, or throw away. It means ensure our body heathy that we ate foods, the other hand also reminds us food's situation, to avoid wasting food.