Abstract
3 kinds of glass, 6 kinds of plastic, 29 kinds of paint, 8 kinds of stone, 11 kinds of ceramic tile, 9 kinds of metal have been exposed to outdoor for 36 months. This report has aimed to clarify the assessment of soil for external building materials these materials exposed for 15 months and 36 months were used for the test. The relation of the color difference, the brightness difference, and the soil of these materials is examined. The soil of materials exposured for 15 months and 36 months are able to be shown in one curve according to the color difference though the testing period has been changeable in 36 months of 15 months.
