| 摘要 |
PROBLEM TO BE SOLVED: To keep clean the ear hole by surely removing moisture in the ear hole. SOLUTION: A water absorption sensitive agent 4 discolored by water absorption is penetrated into the surface of cotton 3, and dried, whereby the water absorbing state of the cotton 3 is detected from discoloring of the water absorption sensitive agent 4, and a user is caused to visually confirm it. |
