Mona Lisa - verifying the painting's authenticity

"The Mona Lisa is a painting that has been incredibly well preserved. The wood is in an absolutely incredible state of preservation for a painting that is, after all, five centuries old," says Jean-Pierre Cuzin, Curator of Painting at the Louvre. The portrait is just over thirty inches tall by almost twenty-one inches wide, painted on a fine-grained white poplar – the favorite wood of Italian painters of Da Vinci's time – with the official Louvre seals stamped on the back.
Mona Lisa detail
The portrait was once more brightly colored than it is today. It was covered with a varnish – probably applied in the 16th century, perhaps to protect it from the moisture of the baths in which it hung at Fontainebleau – which has darkened and turned the painting slightly greenish. But it is this varnish that gives us the best means of authenticating the painting. "One can imitate or copy a painting to perfection,"  says Cuzin, "but the craquelure – all the tiny cracks in the painting's varnish which are documented very clearly in the photographs – cannot be recreated artificially. There was no doubt that this painting was the original by Da Vinci."

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