| 摘要 |
A label for indicating a history of high-temperature exposure includes an internal substance and an external substance surrounding the internal substance. The internal substance and the external substance may be separated into respective frozen solid bodies at low temperatures, the internal and external substances having colors that are different from each other, and at least one of the internal substance and the external substance may convert to a liquid phase and the internal and external substances may be naturally mixed when the substances are exposed to high temperatures higher than the low temperatures for a predetermined amount time, and indicate the history of high temperature exposure without being restored to the initial forms of their frozen solid bodies even when refrozen or re-cold stored.
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