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----- Original Message ----- 
From: "Michael Ridderbusch" <[log in to unmask]>
> If you're referring to phonograph parts,
> isn't it better to leave the original patina alone?
> 
"Metal parts" in this case refers to the mothers and stampers
used to press 78rpm (or other disc) records. Actually, in order
to answer the question properly, it would be necessary to
know what sort of metal they were made of?

...stevenc
http://users.interlinks.net/stevenc/