We, in 1956 the Department of Architecture at the Budapest University of Technology and Economics, decided to start an extensive color harmony experiment. The experimental work, the collation, and processing of the collected data, lasting 50 years, was completed in 2006. The experiments described in this article are based on earlier experimental results obtained from investigation into the harmony content of hue pairs. We then decided to search for a third hue, which in association with an exist- ing pair, with high-color harmony, forms a hue triad with high-harmony content too. The compositions prepared for the experiment were composed in each case of three hues of four identical saturation but different brightness, form- ing a group of 12 colors. The color content of the composi- tions covered the color space uniformly. That was the first stage in the experiment, carried out with 60 compositions. In the second stage, we investigated the effect of the satu- ration content of the colors used in the composition, on the harmony content of the hue triads. For this experiment, we prepared 48 compositions. In these experiments, we applied the method of grading. We concluded that the level of the harmony content of the hue triads depends on the in- clination between the hue planes in the Coloroid color space. We also concluded that to every hue, selected for starting point, six well-definable groups of hues can be or- dered from the Coloroid color space, from which color tri- ads with high harmony content, can be selected. It showed conclusively that the saturation level of the individual members of the triads has a significant influence on their harmony content.
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