As a response to the question from J Golden at University of Iowa, can I suggest that they contact The National Museum of Photography, Film and Television, which is in Bradford, UK. They have a homepage website on: http://www.nmsi.ac.uk/nmpft/ which includes connections to advice on various aspects of conservation (see "subjects"). In general, this is an excellent museum, with extensive experience of all conservation and display of photo/film materials. Chris Prior Media Studies University of Huddersfield, UK