Sequential Sequential Color Schemes
Sequential/sequential schemes are the logical mix of all combinations of
the colors in two sequential schemes. Thus, the schemes are based on two
hues. The hue mixtures may form a third hue (magenta and cyan sequences
produce a variety of transitional purple-blues). If the two hues crossed
are approximate complements, their mixtures produce a neutral gray diagonal
and desaturated transitional colors. Systematic lightness differences throughout
the scheme are important; do not depend on hue to impart the magnitude
message. Use hue transitions to designate differences in proportions of
the two variables mapped. For example, data on educational attainment crossed
with crime rate categories are well represented by a sequential/sequential
color scheme.
Sequential Sequential Color Examples
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Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University