| 摘要 |
PROBLEM TO BE SOLVED: To easily and visually observe a temperature exposure history, by retaining a composition where an organic silver salt oxidizer and its reducing agent are combined and retained on a support such as a film. SOLUTION: A photothermography composition containing behenic acid silver is applied to a polyethylenetelephtharate film support. The film is dried in an air chamber, and then an overcoat composition containing polyvinylalcohol is applied and dried. Then, a pressure sensitive adhesive layer 13 with a release layer 14 is provided. When a device 10 is exposed to a high temperature, the composition begins to become dark, thus making display unclear and hence displaying the time and temperature history of a decaying product such as a photo film where a device 10 is mounted. A silver salt of long-chain fatty acid with 10-30 carbons is preferable as an organic silver salt oxidizer, and a useful reducing agent includes substitution phenol and naphthol, polyhydroxybenzene compound, and aminophenol. |
