| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to perform display readily at a low cost by the clear a change of hues by bringing an A agent and a B agent in non-contact state, and displaying the time or the temperature/time integrated value as the color change. SOLUTION: Agent A and agent B in non-contact state are brought into contact with each other. Thus, the time or the temperature/time integrated value is displayed as the color change. The agent A and the agent B comprise the combination of a radical generating agent and a coloring matter and/or coloring-matter precursor, whose color is changed by the reaction with radical. As the radical generating agents, organic peroxide, azo compound, halogenated carbon compound and the like are listed. As the organic peroxide, dialkyl peroxides and the like are listed. As the azo compound, azo nitriles and the like are listed. As the halogenated carbon compound, carbon tetrabromide and the like are listed. A specified weight % of the radical generating agent is added to a medium forming a carrier body. As the coloring matter and/or the coloring-matter precursor, phenothiazine and the like are listed. |
