| abstract |
The present invention includes at least one polymer layer comprising a latent pigment capable of undergoing one or more discolorations, and an organic acid; Or a device for monitoring an integral value of time and temperature comprising one polymer layer comprising a latent pigment capable of undergoing one or more discolorations and one polymer layer comprising an organic acid, wherein the latent pigment is discolored. It is converted into a pigment form that causes it. The device can be used to monitor sterilization of medical and kitchen utensils, canned food and microwave food cooking. |