DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Ochre cliffs. View of ochre-coloured sandstone rock formations. Ochres are among the earliest pigments used by mankind. They can be various yellow, brown and reddish colours, and are derived from clay that is naturally tinted due to the presence of mineral oxides. Photographed in Rousillon, France.
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