
Although colours like red and green often signal stop or go, varying the saturation of colours can also indicate how the user should interact with the site. Alternatives to red and green are important because about 10 percent of the male population have some form of colour blindness, turning reds and greens into shades of grey.
Reducing the number of colours in the swatch pallete helps the user to concentrate, and reducing the saturation of selected swatches can produce a highly distinguishable hierarchy.
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