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<p>[QUOTE=&quot;zaneman, post: 74956, member: 3970&quot;]Are carbon spots usually brown or green-brown? If so I&#039;m assuming they would just be copper oxidation. 2 Cu + O2----&gt; 2CuO</p><p><br /></p><p>In which case, I would assume if you used something like sodium thiosulphate, or sodium hydrosulfite. Just conjecture though.[/QUOTE]</p><p><br /></p>

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