We've created a smart label that detects the food aging process and informs consumers of its lifespan through four different colors. Consumers can prevent food waste thanks to a more visible label, and stores can reduce waste by assigning different discounts to products depending on which color the label is at. With an existing packaging material, that uses color-changing plastics. These color-changing plastics can monitor the content in real-time. We designed a chromogenic plastic, a unique material that changes its optical properties in response to an external stimulus.