This is kind of neat, opens the door to a whole lot of stuff no doubt:

http://www.cbc.ca/story/arts/nationa...ter041123.html

It also found that portions of a painting by Perugino were probably done by his apprentices.
Busted! In-your-face Vannucci!

That's great, I'd love to know which master works contain portions done by apprentices. For example something tells me that Little Richard had a hand in Don King's hairdo at *some* point... Magnificious.