A previously unknown portrait of a woman by Vincent van Gogh has been revealed in a high-tech look beneath another of his paintings, it was announced today.

Scientists used a new technique to peer beneath the paint of van Gogh's "Patch of Grass."

Already it was known there was something there, likely a portrait of some sort. Van Gogh was known to paint over his work, perhaps as much as a third of the time.

Behind the painting, done mostly in greens and blues, is a portrait of a woman rendered in browns and reds.

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