Cave paintings offer a marvellous insight into the past, with pictures displaying everything from symbols to great battles. In particular, they have shed much light on the society of ancient cultures.
The reddish colour often seen in cave paintings is due to the ochre pigment — one of the oldest materials used by humans. This pigment has been in continual use for over 200000 years. Nevertheless, we knew little about how these civilisations went about making this pigment, until now…
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