Fig. 6From: A Raman micro-spectroscopy study of 77,000 to 71,000 year old ochre processing tools from Sibudu, KwaZulu-Natal, South Africaa Photographs of the two faces of the cortical flake from layer BS7 (square B4c); b characteristic Raman spectra obtained on the flake: (A) amorphous carbon, (B) manganese oxide, (C) haematite, and (D) goethite and c high magnification image of red residues and white fibresBack to article page