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Hello, I am in the process of transferring audio from wax cylinder to audio CD, and every now and then I come across series of cylinders in our collection with a kind of growth on the surface. It fills up the grooves and distorts the recordings. Some of the cylinders are so badly infected that they cannot be played at all. It appears to be a like a kind of fungus, but I am not sure. Has anyone come across this problem and come up with a non-destructive cleaning process? Colin Schlachta Assistant Audiovisual Archives Technician Library, Archives and Documentation Services 100 Laurier Street Gatineau, Quebec (819) 776-8466 FAX (819) 776-7055 [log in to unmask]