From yesterday's
BBC-report
Quote:You can see how Leonardo made the cups transparent, something you can't ordinarily see," he said. "You can also note the state of degradation the painting is in."
That degradation has been the subject of controversy this week.
An Italian newspaper, Corriere della Sera, reported that a sophisticated monitoring and filtration system introduced during a restoration of the chapel in the late 1990s was not preventing particles or substances that could damage the work being brought in by visitors.
The graphics from the above quoted Corriere della Sere (26.10.07, page 20):