| 摘要 |
PROBLEM TO BE SOLVED: To provide a reversible image display medium rewritable and capable of forming an image with a and excellent in contrast low energy. SOLUTION: The reversible image display medium 12 has two sheets 121 and 122 which are opposed to each other via a prescribed gap and at least one of which has light transmissivity, a developer housing cells 124 formed between the sheets and a dry process developer DL included in each cell. And, the dry process developer DL contains at least two kinds of dry developing particles WP and BP having triboelectric property, varying in electrostatic charge polarities from each other and varying in optical reflection density from each other. At least one of the two kinds of developing particles is a magnetic particles formed by incorporating a magnetic body material into a binder resin and having 20-50 emu/g saturation magnetization and at least one of the two kinds of developing particles has 1.0×1010-1.0×1014Ω.cm volume resistivityρ.
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