A spectral color is a color that is part of the optical spectrum. The spectral colors are:

1. Red
2. Orange
3. Yellow
4. Green
5. Cyan
6. Blue
7. Violet

(For historical reasons, it is common to exclude cyan.)

Among some of the colors that are not spectral colors are:

• Grayscale colors, such as White, Silver, Gray, and Black
• Any color obtained by mixing a grayscale color and a spectral color
• Magenta, which, in the color wheel, goes between violet and red.