Relative purity or strength of the spectral color of soil is

Solution (By Examveda Team)

The relative purity or strength of the spectral colour of soil is Hue. The concept of a colour system with a hue was explored as early as 1830, and Munsell's colour system was a great step forward in realizing perceptual uniformity.
It is one of the main properties of a colour, which refers to the degree to which a stimulus can be described as similar to or different from stimuli that are described as red, orange, yellow, green, blue and violet (colour of vision).