[78-L] Churchill Speech - corroded metal disc

[Tim Huskisson]

After doing the magnet test, the disc must be made of solid aluminium,
though it feels heavier than I'd have expected. Some vinegar cleaned the
corrosion very effectively and the disc plays through without skips or
repeats. I have to presume it was an amateur attempt to record Churchill's
speech from a (or the original) radio broadcast.
Thanks to those that contributed to this thread.

Tim 

-----Original Message-----
From: 78-l-bounces at klickitat.78online.com
[mailto:78-l-bounces at klickitat.78online.com] On Behalf Of Mark Bardenwerper
Sent: 16 August 2011 03:11
To: 78-L Mail List
Subject: Re: [78-L] Churchill Speech - corroded metal disc

On 8/15/2011 6:25, David Lewis wrote:
> Is it possible you have an uncoated aluminum? If it is, you should be able
to wash off the white speckling with dish soap. I don't think I've ever seen
a solid, uncoated, steel record, though anything is possible. I had
pre-grooved zinc Echo records from the 1920s at one time, but there's little
chance that anyone would still be using those in 1941. Whereas there were
uncoateds still in use, mostly old, leftover discs as they stopped making
them in 1938.
>
>
You must remove all of the oxide. It is extremely hard and will destroy 
any needle in short order.
You could try creme of tartar or perhaps vinegar in very hot water. You 
are probably not going to wind up with a playable record anyways because 
the first thing to oxidize were the grooves.

-- 
Mark L. Bardenwerper, Sr. #:?)
Technology, thoughtfully, responsibly.
Visit me at http://www.candokaraoke.com

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