You may wish to explore cleaning methods used for CD and DVD nickel stampers. Because these have micron-size features, any method safe for them should be safe for your discs. Some mastering facilities use reactive ion plasmas, but I believe these are suitable for removal or organic contaminants. Others may use an ultrasonic bath with solvents such as trichloroethylene (may not be allowed by OSHA.) I am not an expert in this area, so suggest that you contact someone who is, such as a CD and DVD mastering house or replicator. Jerry Hartke Media Sciences, Inc. > -----Original Message----- > From: Association for Recorded Sound Discussion List > [mailto:[log in to unmask]] On Behalf Of Gerald Fabris > Sent: Wednesday, March 23, 2011 12:33 PM > To: [log in to unmask] > Subject: Re: [ARSCLIST] Cleaning Metal Masters & Mothers > > Hi Larry- > > I'm grappling with this same issue at the moment - how best to clean > Edison disc metal parts. We just contracted a metals conservator to study > the problem and make recommendations. She's working on it now. > > The topic came up on ARSClist in September 2005. If you do a search in > ARSClist for "metal parts", you'll find the discussion. > > If you contact me off-list, I can send some additional comments that I've > gathered. > > Thanks, > Jerry Fabris, Museum Curator > Thomas Edison National Historical Park > National Park Service > United States Department of the Interior > 211 Main Street > West Orange, New Jersey 07052 > tel: (973) 736-0550, ext. 48 > fax: (973) 243-7172