abstract |
(57) [Summary] [PROBLEMS] To uniformly initialize a temperature indicating member. SOLUTION: A temperature indicating member 2 whose color changes in response to temperature. Is partially provided, the temperature indicating member 2 is irreversible at an ambient temperature, and after being initialized by heating and quenching, is initialized according to the temperature and time in a standing atmosphere. The color density of the portion changes, and a blank layer 3 having a predetermined thickness is provided around the temperature indicating member 2. Was provided. |