Picture restoring Is still in many cases literally a matter of spit and polish, but there have been great scientific developments in bringing old masters back to life. The world's major art galleries now use equipment from lasers to nuclear reactors to examine and restore paintings. These studies are providing new insight into the way artists worked and are revealing new facts about paintings, as well as helping to identify fakes more easily.
Presented by James Wilkinson , BBC Science Correspondent A Radio News production