On-site analysis by the LADIR (Laboratory of Dynamics, Interactions and Reactivity) of the pigments of a rock painting San on sandstone. RSA Site BUF1, Eastern Cape, South Africa. Measuring head of the Raman spectrometer. The laser light injected by an optical fiber into the measuring head is focused by a microscope objective on the area to be analyzed. The same microscope objective collects the scattered light that is filtered in the head and then conveyed by a second fiber to the spectrometer. This Raman method, non-destructive and portable, allows the identification of pigments and the assessment of the state of conservation of rock paintings of the San people. Dating of paintings: from 100 to 3,000 years old.