. Vitruvius describes the elaborate techniques used by wall painters, including the insertion of sheets of guide while in the wall to forestall the capillary motion of dampness from attacking the fresco, the preparing of as numerous as 7 levels of plaster about the wall, and using marble powder https://louisu3h6p.blogs100.com/30117039/5-tips-about-large-wall-paintings-you-can-use-today