Alla prima or direct painting
It is a style of painting, used mostly in oil painting, in which layers of wet paint are applied to previous layers of wet paint (Wet-on-wet). The result is colors that blend into one another, and mix in the painting. This technique is a direct method of painting that is completed mostly in one sitting and requires a fast way of working, because the work has to be finished before the first layers have dried. Alla prima painting also has the added benefit of allowing you to mix your paint directly on the canvas as well as on the palette. Famous painters who worked in an alla prima style are as diverse as Paul Cezanne, John Singer Sargent, Mary Cassatt, Winslow Homer, Caravaggio, Hieronymus Bosch, and Frans Hals.