| 摘要 |
A coloration area is provided at least on a surface of a main body whose main constituent is wax. The coloration area is constituted with a coloring constituent which, in turn, has photosensitivity whereby after being irradiated with light, coloration occurs in a state in which there is no light. The coloration area is constituted with a film coated on the surface of the main body, and the film contains the coloring constituent.
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