The appearance of building materials changes with their moisture conditions of their faces. Following findings were obtained from the limited number of psychological and physical test. 1) The color of the material with cosine of contact angle to water larger than 2.0, looks different between in a dry condition and in a wet condition. 2) The color of the textured material with glossiness less than 6% in a dry condition, looks different from that with glossiness of 50 to 60% in a wet condition. The color of the smooth material with glossiness of 60 to 130% in a dry condition, looks same as that with glossiness of 40 to 70% in a dry condition. 3) The color of the material of which color difference dE^* is greater than 2.0 between in a dry condition and in a wet condition, looks different.
