Ochre quarry. Close-up of ochre-coloured sandstone rock formations at an ochre quarry. 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 Colorado Provencal,Rustrel,France | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Psaila, Philippe |
Taille de l’image : | 5125 px × 3411 px |
Model Release : | Non requis |
Restrictions : | - |