You hear about frescos when traveling Europe and understand they are art, but what exactly are they? Fresco is technique artist use and is employed in creating large-scale mural paintings. The method starts with applying wet-lime plaster to the wall or ceiling. (Wet-lime is mix of slaked lime, sand and water.) Before the plaster dries, the artist uses water-based paints to create their images. As  the plaster dries, a chemical carbonation process occurs and the painted ima