| 摘要 |
PROBLEM TO BE SOLVED: To repeatedly develop and erase color many times with satisfactory visibility, color display and color developing density by incorporating reversing agent for repeating a color developing state and an erasing state by an interaction of a coloring compound and a developer. SOLUTION: In a composition which contains coloring compound such as a leuco auramine and the like and a diarylphthalide and the like, developer such as phenol and the like, benzophenone and the like and reversing agent, a mixed ratio of the compound to the developer is preferably 0.1 to 10 pts.wt. or further 1 to 2 pts.wt. of the developer to 1 pt.wt. of the compound. A mixed ratio of the agent is preferably set to 1 to 200 pts.wt. to 1 pt.wt. or further 10 to 100 pts.wt. of the compound. As the preferable agent, compound containing alcohol group including bulky molecular skeleton near a column like steroid skeleton. More specifically, cholesterol, stigmasterol or pregnenolone is used. |
