Re: pinhole copper patina

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From: NFetter@aol.com
Date: Wed Sep 03 2003 - 16:25:57 PDT 

From: NFetter@aol.com
Message-ID: <3d.34690633.2c87d285@aol.com>
Date: Wed, 3 Sep 2003 19:25:57 EDT
Subject: Re: pinhole copper patina

Hi Geoff,
That green crud on copper is a complex copper hydroxy carbonate whose exact
formula may still not be known. It is formed slowly by rain water that contains
some carbonic acid and by exposure to atmospheric oxygen.
Neil Fetter

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