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<p>[QUOTE=&quot;Hobo, post: 407935, member: 11521&quot;]I&#039;ll accept that zinc is more reactive than copper (but I&#039;ll try to remember to verify this later). </p><p>&nbsp;</p><p>I do not accept that copper is &quot;very non-reactive&quot;. Have you ever seen copper used on the exterior of buildings? Copper gutters and downspouts. Copper roofing. Copper flashing. Unless the copper is coated it will tarnish almost immediately and turn a nice green over time. </p><p>&nbsp;</p><p>Gold does not tarnish (for the most part). Take a look at the gold-covered dome on some states&#039; capitol building (e.g., Georgia and Colorado). </p><p>&nbsp;</p><p>I can&#039;t think of silver being used on a building exterior (perhaps hardware like doorknobs and hinges) but I am sure it will tarnish although not as rapidly as copper. </p><p>&nbsp;</p><p>I have seen nickel used in exterior hardware and it does not tarnish nearly as rapidly as copper.</p><p>&nbsp;</p><p>I don&#039;t know of any exterior uses for zinc but we agree that it is highly chemically reactive.[/QUOTE]</p><p><br /></p>

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