We have found that many roman houses in pompeii had "Fresco painting" covering the walls.
Fresco painting, strategy for painting water-construct colors on freshly applied plaster, usually on wall surfaces. The colors, which are made by granulating dry-powder colors in unadulterated water, dry and set with the mortar to wind up a lasting piece of the divider. Fresco painting is perfect for making wall paintings since it fits a monumental style, is solid, and has a matte surface.