Hidden world of bacteria and fungi discovered on Leonardo da Vinci’s drawings

Leonardo da Vinci is famous for his elaborate, nuanced artworks and advanced technological ideas. But new research has revealed another level of complexity to his drawings: a hidden world of tiny life-forms on his artwork.

The findings, the researchers said, could help build a microbiome “catalogue” for artwork. Each of the pieces had a unique enough collection of microbes that researchers could have identified it again later purely from a study of its microscopic biology. And the drawings’ microbiomes had enough key elements in common to help researchers spot counterfeits based on differences in their microbiomes, or even authentic drawings that had been stored in different conditions over the centuries. The researchers also showed that da Vinci’s drawings had a significantly different microbiome than expected, with lots of bacteria and human DNA — likely a consequence of centuries of handling by art restorers and other people. Microbes known to make paper degrade over time were also present, showing why those restorers’ efforts had been necessary The study amounts to a proof-of-concept exercise, showing how microbiomes might, in the future, reveal unexpected histories of certain artworks or help detect forgeries.

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