2015 年 21 巻 48 号 p. 439-442
In order to clarify the aging of interior finishing materials in residences, we carried out actual condition survey on stain of interior finishing in public apartment houses located in Sapporo city. According to the survey results, we found good correlation between duration of residence and brightness change as an indicator of the stain. We also observed that detergent or other cleaning methods for the interior finishing were not able to clean sufficiently after 10 years long residence.