Once more again scientific investigations shake the world of art.
It is up to a painting that is supposed to portray Isabella d'Este. The iconographic features of Saint Catherine could have been added afterwards and under the wheel it is hidden a closed book as for the "cartone" surely attributed to Leonardo da Vinci and kept at Louvre Museum.
Radiocarbon investigations are also involved, but its drawbacks are by now well known (the high associated error, the actual dating of the death of the organism).
Let's wait for some more news.
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