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<p>[QUOTE=&quot;Hobo, post: 408072, member: 11521&quot;]That&#039;s a good point. Zinc is used on galvanized steel pipe. I hate to tell you but this pipe - with its coating of zinc - rusts like he11 on the inside, so much so that over time the pipe will not longer be able to provide adequate flow. It is similar to what happens when a person&#039;s arteries become clogged. (In the pipe it is the steel that rusts, not the zinc.) I am a home inspector and I see these clogged galvanized steel pipes all the time. I can show you a picture of one if you like.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Maybe it&#039;s that the layer of corrosion provides a protective coating.</p><p>&nbsp;</p><p>I think we may have strayed from the original point I was making. I tried to make a point that copper is more reactive than other metals used in coins (except zinc - 2 points for you on that one). I was addressing primarily toning and surface spots on coins.[/QUOTE]</p><p><br /></p>

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