OnVu™ time-temperature indicators (TTIs) are supplied either as printing inks or labels and can in principle be used for any product that is sensitive to temperature. They give a visual summary of a product’s accumulated chill-chain history, recording the effects of both time and temperature. Every indicator is tailored to the shelf life and optimum storage conditions of the product it is designed to monitor. By providing essential information on chill-chain history, OnVu™ TTIs also help to optimize shelf life, since suppliers and retailers will no longer need to discard products prematurely to cover for potential spoilage, caused, for example, by incorrect storage.
OnVu™ TTI technology relies on the properties of pigments that change color over time and when temperatures fluctuate. The label or display consists of a reference color and an OnVu™ TTI. Once activated by a suitable light source, the TTI first becomes dark and then grows progressively lighter as time passes and also if and when the ambient temperature rises. Exposure to higher temperatures than those prescribed, therefore, accelerates the lightening process of the color. When the activated color attains the same shade as the reference, the product has reached the end of its shelf life. The first OnVu™ TTIs have been designed for the meat and dairy industries. Further applications are planned.
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