Thought I'd posted this yesterday, but must have forgotten!
The Baltimore Sun has an interesting piece about the conservation work being done on the "Birds of America" elephant folios belonging to the Maryland State Law Library (first discussed here back in September). This story focuses on the actual conservation measures being taken at the Conservation Center for Art and Historic Artifacts in Philadelphia to clean up the plates. Most of the work is reasonably conventional, although I was surprised to learn that they decided to digitally reproduce a foot for the damaged wild turkey.
