Red-violet refers to a rich color of high medium saturation about 3/4 of the way between red and magenta, closer to magenta than to red. In American English, this color term is sometimes used in color theory as one of the purple colors—a non-spectral color between red and violet that is a deep version of a color on the line of purples on the CIE chromaticity diagram. In use by some artists red-violet is equivalent to purple. Since violet and purple vary so much in meaning when comparing speakers from different countries and languages, there is much confusion. The Munsell color system includes the hue term purple, and for some (especially US) speakers of English at the maximum chroma of 12, this refers to 'Red-Purple". This convention is for chromatic purposes, since Red-Purple lies between violet and printer's magenta (the color regarded as magenta before the invention of the web color magenta for computer displays). Relationship of red-violet to other colors Red-violet is part of the red "analogous color group", which also includes magenta, red, red-orange, orange, gold, and yellow, i.e., those colors classified as "warm colors", or colors that produce a feeling of warmth (as opposed to "cool colors"). The color that is the complement of red-violet, mint green, lies halfway between green and spring green. It is very close to sea green but highly saturated and of a bright hue. In some traditional usage, red-violet is the name given to an intermediate, or tertiary color that, along with yellow-orange (gold) and also green-blue (cyan), forms a color wheel triad group. Most contemporary usage, however, would list magenta as the name for the tertiary color in question. Red-violet Red-violet or pigment purple (pigment red-violet) represents the way the color purple (red-violet) was normally reproduced in pigments, paints, or colored pencils in the 1950s on an old-fashioned RYB color wheel. This color is displayed at right. The normalized color coordinates for red-violet are identical to medium violet red, which was first recorded as a color name in English with the formalization of the X11 color names over 1985–1989. By the 1970s, because of the advent of psychedelic art, artists became used to brighter pigments, and pigments called "purple" or "bright purple" that are the pigment equivalent of electric purple became available in artist's pigments and colored pencils. Reproducing electric purple in pigment requires adding some white and a small amount