Pictographs

Ancient people sometimes painted pictures on rocks with paint made from surrounding natural sources, such as vegetation, dirt, and rocks. Pictographs are not so enduring as petroglyphs, and wear away quicker since they are on the rock’s surface instead of etched into the rock as a petroglyph is. If any pictographs are found, we must not touch them at all, as human oils in the skin are not conducive to prolonging the life of the art.