From MSNBC:
LONDON – 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. The concealed image shows a woman with one hand clutched to her breast, the other outstretched, kneeling before what experts said was planned to be an infant Jesus. Leonardo apparently was planning a picture of the adoration of the Christ child, a scene popular with Renaissance artists, but changed his mind.
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