How Romans made marble statues 'real'

The Romans have a reputation for being brilliant engineers and soldiers, but what isn't as well known is that they also gave us wonderful artistic treasures. 

The latest scientific techniques suggest that marble statues in the ancient world were not as monochromatic as we may imagine. 

Alastair Sooke looks at the Treu Head in the British Museum, an important and rare marble head from the mid-second century AD, which would have been painted to make her look "like a real person".

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