Archived posting to the Leica Users Group, 1997/04/14

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Subject: Re: Cassettes
From: gmrobinson@mmm.com
Date: Mon, 14 Apr 1997 08:40:57 -0500
 
>There is a chemical compund that turns brass black.  It also works with
>aluminum.  Can't remember its name or who was selling it.  If you find
>out please let me know.
>Randolph
>
>
>The process is called anodization.  This is done by speciality shops.  

Glen Robinson