Once the warm green dried – and more than one layer of it in some areas – it was time to add the cool green. This green is a viridian or phthalo green, so there is a bluish tint to it. The next picture shows the pale layers before they begin to build up. Warm and cool greens begin to meet.
Subsequent layers – two or three more -begin to show the intensity of the colors, as well as areas where warm and cool work together to show the underside of a leaf, such as on the far right side. Mottling is done to see how warm and cool will work together underneath yet another layer of green. Below you will see a leaf with a lighter, warmer green center surrounded by cooler green.