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<p>[QUOTE=&quot;-jeffB, post: 1370933, member: 27832&quot;]Alloy, gotcha. Zinc is certainly more reactive than copper or even tin, but I honestly don&#039;t know how brass, bronze and copper compare when it comes to oxidation susceptibility.</p><p><br /></p><p>Anyhow, the green spots aren&#039;t <i>just</i> oxidation -- copper oxide is brown or black. With CO2, you get copper carbonate, which is green; with PVC residue, you get copper chlorides, which also tend to be green. &quot;PVC residue&quot; gets its own category from the TPGs, but the end result of it is corrosion.[/QUOTE]</p><p><br /></p>

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