Van Gogh's hidden portrait

A Vincent van Gogh portrait of a peasant woman that was painted over by the artist has been revealed in extraordinary detail through use of an x-ray technique that has never before been applied to a painting.



Research had previously disclosed the vague outline of a head behind the painting, entitled Patch of Grass, but the face of the woman emerged from the centre of the work only after the picture was subjected to x-ray fluorescence spectroscopy.

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