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The shading scheme used on a choropleth map
is used to convey a sense of magnitude to
the user.
Darkness is a surrogate
for the magnitude of
the data in each of the enumeration areas.
Dark Areas = High Values
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This is an example of a monochromatic choropleth map.
| It is wise to avoid the use of 100% black as a shade, since it tends to visually dominate the map. | 
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Shading -- Color Color is commonly used on choropleth maps. In this example the hue (color) and value (lightness) are being manipulated to convey a sense of magnitude to the user.
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View Examples:
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