Soil color card color comparison

Soil colorimetric card, is based on the Menzel color system and Menzel color nomenclature combined with the characteristics of soil color compilation, used to determine and describe the color of the soil standard colorimetric card a total of 13 shades, 443 kinds of colors, unique waterproof design, 2009 version, production date 2022. soil colorimetric card, according to the Menzel symbols are systematically arranged. This arrangement consists of three-dimensional variables that combine to describe all colors, and this three-dimensional variables are what we call hues, color values and chromaticities in the Menzel system.
.. Hue is the color of an object, i.e., the predominant spectral color. The Munsell Loam colorimetric card contains 9 basic hues (5R, 7.5R, 10R, 2.5YR, 5YR, 7.5YR, 10YR, 2.5Y, 5Y), 1 olive green hue (10Y-5GY), 2 gray hues (GLEY1, GLEY2) and 1 white hue (WHITE). The color tones are marked in the upper right corner of the colorimetric card and the edge of a total of 13 tones. r (red), y (yellow), g (green), b (blue) p (purple), yr (yellow-red), gy (green-yellow), bg (blue-green), pb (purple-blue), rp (red-violet).
Color value refers to the relative brightness of the soil color, with no color (N) as the benchmark, the pure black (ideal black) as 0, the pure white (ideal white) as 10, divided into 0-10 from dark to bright equal points. In the vertical direction, the color from the bottom to the top of the color card is constantly equal steps brighter, and the color value is equal steps larger. The color value is marked in the form of vertical coordinates in the left column of the colorimetric card. Chromaticity refers to the relative purity or intensity of the spectral color, divided into 0-10 from weak to strong, the higher the chromaticity, the more intense color. Chromaticity in the form of horizontal coordinates marked on the bottom of the colorimetric card. The order of color naming is hue, color value, chromaticity, such as a soil hue is 2.5YR, color value is 4, chromaticity is 3, then the nomenclature is 2.5YR4/3. The complete nomenclature of the soil color is the name of the color + Menzel color naming, such as reddish brown (2.5YR4/3). The soil color is determined and recorded by comparing a soil sample to a card with a standard color scale.