岡山県鴨方町の町家公園内にある旧高戸家住宅の土壁の色彩

概要

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The color of the red clay walls of a 'machiya' (former Takato Houses) in Kamogata, Okayama Prefecture was measured and described with L^*a^*b^* color description method. The clay used for the walls of the house is from the soil of Mt. Youshou nearby. The earth of Mt. Youshou was geologically investigated at the outcrop and through literature on geology. Mt. Youshou is composed of the late Cretaceous rhyolite, tuff, and breccia. The summit area of Mt. Youshou has not been eroded since the early Pleistocene and its earth is deeply weathered and is a red color. Its grain size and chemical elements were also analysed. It turned out that the red color of the earth is from Fe-ion. Secondly, in order to identify the coloring elements of the clay walls, the authors used the newest handy type X-ray fluorescence spectrometer and the results of the measurements at the place showed that this red color comes from Fe (Fe_2O_3). Thirdly, the comparison was made between the color averages and color distribution of the red clay walls of former Takato Houses and those of the red clay walls of other important cultural properties of which color the authors have been measuring. Lastly, using the average value of the measured colors at many points as an object color, the colors were reproduced in a computer color matching system, and a highly precise result was obtained.
2003-01-30