Page 67 - RoadCem Manual - PCT BV
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   Figure 4.16 Lightness or Darkness of color.
Chroma is the relative purity or strength of the Hue.
Figure 4.17 Chroma.
The typical notation of color is an alpha-numeric term of Hue Value/Chroma or 10YR 5/6. Some colors have symbols such as N 6/. These are totally achromatic (neutral color), and have no hue and no chroma, only a value.
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