| 摘要 |
PROBLEM TO BE SOLVED: To provide a bathtub, a washbowl and a sink for evaluation which enable comparative, relative evaluation of color, quality of appearance, smoothness and the like to be easily carried out depending on vision. SOLUTION: The bathtub for evaluation has its inner surface divided into two in the vertical direction relative to a user so that a drain hole is divided, with one of the divided surfaces having a different surface property from the other of the divided surfaces.
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