> the work of a follower of Leonardo and not the work of Leonardo himself How are they certain now that it is indeed Leonardo's job. Also if the exact same pa

> the work of a follower of Leonardo and not the work of Leonardo himself How are they certain now that it is indeed Leonardo's job. Also if the exact same painting is sold for $60 when it is thought to be work of a follower of Leonardo and $450m when it is believed to be Leonardo's work, what does this say about the collectors?