A beautiful but unsigned piece of Rennaissance artwork was recently
purchased at auction, but the buyer had some detective work in mind: in
the upper-left corner was a fingerprint left in the
dried paint, which - after computer analysis - appears to match that of Leonardo Da Vinci's. Jumping from an unsigned work to a verified Da Vinci, of course, has an impact on the painting's value. Because the artist consistently used his fingers in creating his paintings there's several examples to be used for comparison, which could be as good as a signature if this forensic art expert's research stands up to scrutiny.
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