The opening installment of an investigative series making the case for a new search for Leonardo da Vinci's lost Battle of Anghiari. It begins in the Vatican's Sala di Costantino, where restorers cleaning Raphael's last frescoes uncovered a hidden preparatory system of Greek pitch and iron nails and concluded that Raphael meant to paint the entire room in oil. Where the restoration team reads invention, this installment reads inheritance. The same materials appear together in the Florentine Republic's 1505 purchase records for Leonardo's mural, a connection no published scholarship has drawn. It states the case the series will argue and the verdict it must answer.
Dave Yoder (Sun,) studied this question.