We have found that many roman houses in pompeii had covering the walls.

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. 

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