. Vitruvius describes the elaborate methods employed by wall painters, such as the insertion of sheets of direct inside the wall to circumvent the capillary action of dampness from attacking the fresco, the preparing of as several as 7 levels of plaster around the wall, and using marble powder https://jeffreyvaeat.dailyhitblog.com/34720566/not-known-factual-statements-about-large-wall-paintings