All archaeological sites and remains in Namibia are protected by law (National Heritage Act 27 of 2004). Some incidental protection is provided by the Environmental Management Act (7 of 2007) which includes man-made features in its definition of the environment.
Recorders should not collect anything from the site, ever.
You should never moisten paintings to enhance them for photography.
The most abundant traces of human occupation in the Namib Desert are stone artefacts. These are easily recognised as isolated finds and as surface scatters on the gravel plains of the Namib. Stone artefacts were made by removing flakes from a selected core, or block of raw material, using precise blows that leave unmistakeable evidence of human manufacture. Similar breakage patterns very rarely occur in nature. Over time, methods of artefact production became more sophisticated and the different techniques of flaking provide some indication of age. Other artefacts include metal items and objects obtained through trade such as glass beads, porcelain etc as these are a helpful indication of age.