Da Vinci drawing discovered under his painting 'Virgin of the Rocks'

National Gallery experts using infrared techniques have discovered a Leonardo da Vinci sketch hidden underneath a painting by the Italian master, conservationists said Friday.
The sketch — the first unknown Leonardo image to be found in decades — is beneath the delicate brushstrokes of the artist's "Virgin on the Rocks," a powerful scene of Christ's mother in a dusky cavern, which hangs in the London museum...Click title for the story

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