[78-L] Churchill Speech - corroded metal disc

[Mark Bardenwerper]

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.
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