Summary: Label contains a gelatin layer that degrades in roughly the same way as the food inside the package. If the label is smooth, the food is likely good; i

Summary: Label contains a gelatin layer that degrades in roughly the same way as the food inside the package. If the label is smooth, the food is likely good; if the label is bumpy, the food is suspect. Designed originally for the visually impaired, the product has much wider application. Cool.