Hue (H)
hue is that attribute of a color in the Munsell color system by which we distinguish red from green, blue from yellow, etc.
Discussion—The Munsell color system has principal hues of red (R), yellow (Y), green (G), blue (B), and purple (P), placed at equal intervals around a neutral point. Between the principal hues are five intermediate hues: yellow-red (YR), green-yellow (GY), blue-green (BG), purple-blue (PB) and red-purple (RP). Munsell hue is designated with an alpha-numeric code (for example, 7.5YR).