a chart showing a continuous circle of colors, normally consisting of twelve hues (yellow, yellow-orange, orange, red-orange, red, red-violet, violet, blue-violet, blue, blue-green, green, yellow-green). The sequence of the colors is that of the rainbow or natural spectrum, and their relative positions on the circle are used in determining types of color harmonies. See diagram below. (DIAGRAM)—SHSBC Binder 30 Approved Glossary