The microsample analyzed by the team. oxide, PbO,"The same PbO compound was found in several microsamples taken from the surface of, another famous painting from da Vinci. However, the only references to PbO in the Italian artist's writings were related to skin and hair remedies.
Even though it's not included in his writings, it nevertheless seems that da Vinci made use of this lead oxide as a ground layer. It's something that's been hypothesized about before, but now we have more direct evidence of it. It's thought that the lead oxide power would've been heated and dissolved in linseed or nut oil by da Vinci, producing a mixture that's thicker and faster drying than traditional oil paints – a recipe that then went on to be used by other artists.painting by Rembrandt, created in 1642 – almost a century and a half after the Mona Lisa. That suggests the Dutch master used a similar technique to da Vinci.
This discovery is another example of how modern-day analysis techniques are opening up new findings about historical artifacts.
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