Elemental maps reveal hidden beauty of Roman portrait
By 
Emma Stoye2017-08-21T20:07:00
Analysis of a degraded wall painting at Herculaneum may help conservators clean and restore it
Conservation scientists using x-ray fluorescence spectroscopy (XRF) have revealed different layers of colour and an underlying sketch beneath a 2000-year old wall painting of a woman’s face in the ancient Roman city of Herculaneum.