On Color Specification for Gravel Materials

Abstract

The author attempted to specify the color of the gravel materials for landscaping in objective and easy to understand form.
13 items of the gravel materials were taken as the samples for colorimetry, and the items were classified into 1) the natural gravels which were sorted according to colors and those which were not sorted, 2) the crushed stones of one color and those of mixed colors. The grain size of every item was made uniform.
As for 100 stone grains of each item in natural dry condition, the surface color was mesured one by one with a colorimeter of measured diameter 3mm, and the colors were represented mainly with the table of the mean values of Yxy (table 3) and the graph of color distribution using the numeri-cal values of HVC (fig.1-7).