Heat sensitive color developing material and heat sensitive element using the same

摘要

PCT No. PCT/JP97/00210 Sec. 371 Date Dec. 5, 1997 Sec. 102(e) Date Dec. 5, 1997 PCT Filed Jan. 30, 1997 PCT Pub. No. WO97/28228 PCT Pub. Date Aug. 7, 1997A thermal-sensitive color developing material containing metal particles and a matrix substance where the size of the metal particles irreversibly increase at room temperature due to cohesion, and a thermal-sensitive element using the thermal-sensitive color developing material are disclosed. The thermal-sensitive color developing material irreversibly develops a color at a temperature of room temperature or higher.