Temperature history displaying medium and manufacturing method thereof and temperature history displaying method using the medium

摘要

A temperature history displaying medium including a color forming component which includes an electron donating dye and an electron accepting compound and which achieves a colored state by the reaction of the electron donating dye and the electron accepting compound, and a color erasing component which includes a color erasing agent, wherein the color erasing agent has a function to discolor the color forming component in the colored state, wherein the discoloring is triggered upon application of at least one of dotted heat and patterned heat, and wherein a temperature history is determined depending on the discoloring state of the color forming component in the colored state. In addition, a temperature history displaying method using the medium is also provided. Further, a method for manufacturing the medium is provided.