Studies on the Color of Shirakawasuna-sand

Abstract

To clarify the special quality in the color of Shirakawasuna-sand as a material for landscaping, the comparative studies on the colors of sands and pebbles were made. Materials: Shirakawasuna-sand on the market, the weathered Kitashirakawa-granite sand collected from rivers and mountains, and 3 kinds of white sands and pebbles for landscaping. Methods: The colors of the sands and pebbles were measured by photoelectric colorimeter, and specificated by CIE 1931 standard colorimetric system. The cleared matters are as follows-(1) Difference in colors between Shirakawasuna-sand and weathered Kitashirakawa-granite sand.(2) Change in the color of Shirakawasuna-sand by dryness and moisture.(3) The common feature in the colors of white sands and pebbles.