The Digital Clinical Chart project treats artworks a bit like medical patients, gathering together all of the known history of a painting, then exposing the artwork to various diagnostic tools and procedures, from extreme high-resolution photography and scanning technologies like infrared, ultraviolet and X-ray to 3-D laser modeling. During the remodeling of the hall in 1563, the architect and painter Giorgio Vasari covered the walls with frescoes of military victories by the Medicis, who had returned to power. The goal is to locate the sulfur in Leonardo’s ground layer, the tin in the white prime layer and the chemicals in the color pigments, like the mercury in vermilion and the copper in blue pigments of azurite. So when he saw the new mayor dashing across the Hall of 500 that July afternoon, Seracini rushed at the chance for a personal appeal to Renzi, who had been a fan of the project before his election.

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