Explain about the term- Chroma

Chroma is the relative purity or strength of the spectral colour and its numerical value extend from (/0) for neutral colours to (/8) for the strongest expression of colo ur.

Munsell notation  for a given soil sample can be determined  by comparison with a Munsell system colour book  (Fig. 1.2(a)) which consists of different coloured cards, or charts, systematically arranged according to their hue as defined above. A card of particular hue  has a series of chips arranged vertically to show equal steps from the lightest to the darkest shades (value) of that  hue as shown in Fig 1.2(b).  For a particular value  colour chips are arranged horizontally in the order of their increasing chroma from left to right.  The three properties are always given in the order hue, value and chroma, for the example quoted above (7.5R 7/3) 7.5R is the hue, 7 is the value and 3 is the chroma.