Munsell Soil Colour Chart
Definition
A physical book of matt colour chips arranged by hue, value, and chroma, published by X-Rite/Munsell Color. The analyst holds a chip next to the sample under standardised lighting until the closest visual match is found, then reads the notation from the chip's position.
- Publisher
- X-Rite / Munsell Color
- Format
- Book of matt colour chips
- Organisation
- By hue, value and chroma
- Procedure
- Chip held next to sample under standard lighting
Common questions
Why must the chart's own chips be checked for condition before use?+
The printed chips can fade with age and handling, which would shift every reading taken against them, so quality-conscious labs periodically replace worn charts or verify chips against a known reference to keep results consistent over time.
What is the practical difference between this chart and a digital spectrophotometer reading?+
The chart gives a fast, low-cost visual approximation suitable for field screening, while a spectrophotometer produces an instrumental, observer-independent colour value that is generally preferred when a precise, defensible comparison is required.
Related terms
- Chroma
- The saturation or colourfulness of the hue, from 0 (neutral grey) outward in whole-number steps. Strongly weathered, iron-oxide-rich soils have high chroma;...
- Hue
- The dominant wavelength family of a colour, expressed as a position on the Munsell colour wheel. Soil hues run from 10R (red)...
- Inter-Observer Variability
- The tendency of different trained examiners to assign slightly different Munsell codes to the same sample. Research has shown this can span...
- Spectrophotometry
- Instrumental measurement of reflectance at each wavelength across the visible spectrum, producing a numerical colour profile. Results can be expressed in CIE...
- Value
- The lightness dimension of the Munsell system, scaled from 0 (theoretical black) to 10 (theoretical white). High-organic soils tend to have low...