A biomedical engineer with a U.S. degree and a passion for art conservation, Seracini began looking for the painting, sometimes known as "The Lost Leonardo," in 1975.
Exploring inch by inch the huge Vasari mural he thinks might be hiding Leonardo's fresco, Seracini noticed an inscription, almost invisible from the floor, on a tiny green flag.
"Cerca Trova" -- "Seek and You Shall Find," says the cryptic message, the only writing in any of the six battle scenes decorating the Hall of the 500.
"It puzzled me then and it still puzzles me now. It could be an army motto. Or maybe it doesn't mean anything. But maybe it's a hint," Seracini said.
A very interesting article...