You can apply pigment in different ways:
You can apply it by filling it tightly to give it a density and intensity of shade.
You can gently apply pigment to get light overflows
When you apply the pigment on a dark base you can combine contrasting shades and place them next to each other but only if the shades are manifested not in the intensity of the color, but with a slight shading. As in this case the dark base absorbs all the "dirty" combinations. This way you can create the effect of "gasoline" spots and combinations.
Contrasting colors in eye makeup are not connected next to each other. When we use black,dark gray or dark brown base all the intensity of the color absorbed.