I recently cleaned up an early Gramophone Company stamper of
nickel-plated copper, which had been coated in paraffin wax to prevent
tarnishing. Following able advice from Mark Hogan at the National Film
and Sound Archive in Australia, I placed the stamper in a 50/50 solution
of isopropanol and de-ionised water, bringing it up to a temperature of
70 degrees Celsius. The ridges (negative grooves) were lightly brushed
to loosen the melting wax, and afterwards the disc was rinsed in

In consultation with the EMI Archive and others, after use the stamper
wasn't recoated, but placed between acid-free paper in a sealed
container for storage. 


Will Prentice
Technical Services
British Library Sound Archive          Tel: +44 (0)20-7412-7443
96 Euston Road                         Fax: +44 (0)20-7412-7416
London NW1 2DB                
UK            		 (online

-----Original Message-----
From: Association for Recorded Sound Discussion List
[mailto:[log in to unmask]] On Behalf Of Doug Pomeroy
Sent: 17 September 2005 22:58
To: [log in to unmask]
Subject: Re: [ARSCLIST] Metal Parts

All the Victor/Bluebird, and Decca parts I have transferred (fathers, 
mothers and stampers)
have been nickel-plated copper, the nickel being the recorded surface.

(The film Command Performance says Victor also employed a final plating
but I find that more than a little hard to believe.)

My experience with parts from the 20's, 30's and 40's is that the nickel

rarely shows any signs
of tarnish. In any case, I use Noxon metal polish and a suitable soft
followed by distilled
water and drying with lint-free paper towels. My tests have shown this 
treatment does not degrade
the surface in any audible way.

At the Sony Studios they are doing the same.

Doug Pomeroy

>From: Michael Shoshani <[log in to unmask]>
>Reply-To: Michael Shoshani <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [ARSCLIST] Metal Parts
>Date: Thu, 15 Sep 2005 17:42:11 -0500
>Kurt Nauck <[log in to unmask]> wrote:
> >Greetings All
> >
> >What is the preferred method of cleaning and storing metal parts?
> >
> >I would think that alcohol would be a safe and effective cleaning
>I believe record companies actually cleaned them with naphtha. Victor
>stored them vertically in large envelopes, or so they showed in the
>promo film "Command Performance"
> >Should anything be applied to keep them from corroding (gun oil, 
>Weren't fathers and stampers usually copper with a nickel backing?
>Gun oil might work; you need something to keep the copper from turning
>green, but removable so that the recording itself is accessible. I
>don't remember what mothers and matrices were made from, or whether
>those are susceptible to corrosion...
>Michael Shoshani
>Chicago IL

Express yourself instantly with MSN Messenger! Download today - it's

Experience the British Library online at
Help the British Library conserve the world's knowledge. Adopt a Book.
The Library's St Pancras site is WiFI - enabled
The information contained in this e-mail is confidential and may be legally privileged. It is intended for the addressee(s) only. If you are not the intended recipient, please delete this e-mail and notify the [log in to unmask] : The contents of this e-mail must not be disclosed or copied without the sender's consent. 
The statements and opinions expressed in this message are those of the author and do not necessarily reflect those of the British Library. The British Library does not take any responsibility for the views of the author.