Patent ID: 8623505

Claim:
A decolorizable color developing particle comprising: a color material accounting for 41 to 50% by mass of a total amount and comprising an amount m L of a color developing compound and an amount m D (m D <m L ) of a developer; and a binder accounting for a remaining portion, island portions that are rich in the color material being distributed within a sea portion that is rich in the binder, wherein when a radius of the color developing particle is defined as R, and an arbitrary distance from the center is defined as R 0 (R 0 <R), a total area I 1 of the island portions and an area S 1 of the sea portion within a region having a radius R 1 (R 1 >R 0 ), and a total area I 2 of the island portions and an area S 2 of the sea portion within a region having a radius R 2 (R 2 <R 0 ), satisfy a relationship shown below: ( I 1 /S 1 )<( I 2 /S 2 ).