The document discusses different types of color saturation on a color wheel. The outermost colors are the most saturated prismatic colors, while the inner colors are the least saturated achromatic grays. It notes that gradients between colors contain an infinite number of hues. When setting up saturation gradients using all color wheel complements, it forms a pattern of alternating prismatic, muted, and chromatic gray sections. The document advises paying attention to value differences between saturation levels when creating color studies.