From: Patent Tactics, George Brock-Nannestad


Hello metal owners,

I consider that speaking to a metals conservator as you suggest is the only 
sensible thing. I would be very surprised if Edison's metalwork was nickel in 
all instances, and I would suspect presence of copper and silver. Pitting 
corrosion cannot be excluded.

I am fascinated by the idea that we (in the sense "humanity"!) have material 
so close to the original recordings.

Best wishes,


George



Jerry Hartke wrote:

> 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