Chroma refers to the relative purity or strength of the
spectral color. Chroma runs from 0 (neutral gray) to 8 (highest
strength of color found in soils).
Chroma increases to the right across the Munsell page.
All chips in a column have equal chroma.
Zero-chroma chips have no color, they are neutral gray.
Often they are simply given a hue designation N (neutral).
