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July 1998

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Subject:
Re: Cu stains on Au fingers
From:
Andy Magee <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Wed, 8 Jul 1998 12:10:30 -0400
Content-Type:
text/plain
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text/plain (24 lines) 
Doug,

Several times over the years I've seen copper deposit on gold through
some sort of auto-catalytic process (perhaps a local galvanic reaction?)
when the copper concentration got too high in an acidic cleaner. It
looked exactly as you described. Changing the cleaner more frequently
solved the problem.

Andy Magee
Flex Guru
[log in to unmask]

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