Re: Why does gold leave a black mark on the skin of some people?

Date: Mon Feb 23 10:37:08 1998
Posted By: Jerry Eichler, Post-doc/Fellow Biochemistry
Area of science: Biochemistry
ID: 886308110.Bc

Message:


Hi Christy, 
First off, are you sure it is black or rather dark dark green? I can explain 
green - in lower karat gold, there is contamination by copper. The copper 
undergoes a chemical reaction with oxygen in the air to give the green.

Now, if your black is really black, then I don't know!

Hope this helped!

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