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|1. (WO2017033489) TEMPERATURE HISTORY DISPLAY OBJECT|
|Title:||TEMPERATURE HISTORY DISPLAY OBJECT|
The purpose of the present invention is to provide a temperature history display object with which the time when the temperature of the display object deviated from storage temperatures can be specified. The temperature history display object according to the present invention is characterized by comprising a color developer layer constituted of an open-cell porous object having a color developer supported therein, a color former layer constituted of an open-cell porous object having a color former supported on a surface thereof, and a barrier layer which separates the color developer layer from the color former layer, the barrier layer having been disposed between the color developer layer and the color former layer and adjoining the color developer layer and the color former layer in a horizontal direction.