Image Credit: daphne.palomar.edu

The scale shown above is an example of a saturation scale in which the compliments are mixed to achieve a neutral, chromatic gray.
Chromatic Gray - a chromatic gray is a neutral that is created by mixing complimentary colors of equal value.  Doing this neutralizes the saturation of a color.

There are four means of varying the saturation of colors in both the additive and subtractive color systems, these are:

1. add a neutral to the hue
2. mix the compliment of the hue with the hue
3. overlay combinations of transparent color
4. experimental hue to hue mixing
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