| abstract |
A variety of indicators, e.g., time, temperature, time-temperature, freeze, thaw and sterilization are reported and used for monitoring quality of perishables. However, these indicators are tamperable, e.g., an indicator can be opened, removed, repositioned, exchanged or replaced. Disclosed are tamper evident time, temperature, time-temperature, freeze, thaw, sterilization and like indicating devices. If an indicator is tampered, it will be either destroyed or will provide a visual indication or a message, such as “VOID” or “TAMPERED”. |