How to use

The reliable indicator display consists of a heart shape con-tained within an apple. First, the display is activated with a UV light. Once activated, the heart turns a dark hue. This forms a striking difference with the light color of the surrounding apple. These clearly contrasting colors indicate that the produce is safe to consume.

The heart becomes progressively lighter over time. Exposure to excessive temperature fluctuation accelerates the lighten-ing process. You can see how this works on the accompany-ing chart. The color of the heart is a simple visual indication at a glance.