Restorers work to conserve art battered by Katrina
CHICAGO -- Helen Conklin whisks a cotton swab delicately across a 19th century painting of silvery fish set in deep earth tones. She's looking for, of all things, mud on the canvas -- and sure enough, there it is. She peers at another painting through a microscope, focusing on a cardinal's rich crimson robes that have faded to a sickly pink. That's the mark of floodwaters.

