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A painting bought for $19,000 by a Canadian dealer two years ago has been valued at $150 million after it was determined to be a work by Leonardo Da Vinci. Carbon dating and infrared techniques convinced experts that the portrait on vellum was a genuine Da Vinci. The final proof came when analysis found a fingerprint "highly comparableā€ to one on the artist's painting, St. Jerome. [...] The portrait is the first major Da Vinci find in more than a century.

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