Scientists have recently analyzed the painting with modern techniques such as X-ray florescence spectroscopy. Their conclusions show that Da Vinci applied over 40 different layers of glaze (each up to 50 times thinner than the width of a human hair!) to create Mona’s world famous smile.
Unfortunately, each of these layers required several weeks to dry – with 40 different layers, you can see why it took Leonardo a few years to finish her!
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