Cyan is a pure spectral color, but the same hue can also be generated by mixing equal amounts of green and blue light. As such, cyan is the complement of red: cyan pigments absorb red light. Cyan is sometimes called blue-green and often goes undistinguished from light blue.
An example of a cyan color in the RGB color space has intensities [0, 221, 221] on a 0 to 255 scale. On a browser that supports visual formatting in Cascading Style Sheets, the following box should appear in this color: