Wouldn’t simply controlling temperature and humidity where the item is stored prevent this?
Good Lord, this is why Britain will never give the Elgin marbles back to a third world backwater like Greece.
Italians should take note and be grateful that they've been left with sufficient stuff to keep their miserable little museum country open four days a week.
Hell I'm in a cranky mood...
Damn prostate must be acting up.
With all the money floating around; I am sure they will some to restore these treasures.