Von: "Gary A. Galo" <[log in to unmask]> > I believe alcohol is a solvent to the celluloid surface on a > Diamond Disc. It's also a solvent to shellac, so it shouldn't be > used on the vast majority of "78-rpm" records. The surface of a Diamond Disc is a proprietary polymer called Condensite. I don't know if it's related in formulation to celluloid, but the Edison company recommended cleaning Diamond Discs with alcohol. I'm trying to find out if one specific category of alcohol, like rubbing alcohol, will work safely while others, like grain alcohol, will not. I've always avoided rubbing alcohol for most cleaning chores because it contains a lot of extra ingredients besides the alcohol itself.