The WarmMark is a single-use time-temperature indicator that alerts users when a product is exposed to unacceptable temperature conditions. As temperature-sensitive products spoil and deteriorate quickly if not kept under optimal temperature, the WarmMark temperature indicator provides a visual warning when cold chain breaches have occurred, preventing users from accidentally distributing spoilt goods that are unfit for consumption. With three breech windows, users can check the duration of exposure -brief, moderate, or prolonged, allowing decisions on whether the product is still safe for consumption to be made. The WarmMark is also designed for easy activation. Simply fold up and pull out the indicator activation tab, then remove the adhesive liner and paste the indicator to a clean and dry surface. This temperature indicating label is ideal for applications in Chocolate, Floral, Food, Raw and Cooked Meats, Tissue Samples, Chemicals, and Pharmaceuticals.