Set 10 has a medial hue difference between the figure and ground colors (which means midway between minimal and maximal, minimal being the least difference possible but still visible, and maximal being the most difference possible, i.e. opposite hues, or complementary hues): Dioxazine Purple figures on thalo blue/green grounds; minimal luminosity difference (both figure and ground are light, both medium, or both dark); and minimal intensity difference (both figure and ground are high intensity, moderate intensity, or low intensity).

William Tapley
Art of Color
Color Descriptions of
Sets   Paintings