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<p>[QUOTE="physics-fan3.14, post: 767539, member: 19165"]It is a similar idea. Basically, many metals will form layers on their surface (known as passivity). A bare metal will corrode quickly, but as this passive layer forms, the corrosion slows. Silver sulfide is an example, copper oxide is an example, rust (ferrous oxide) is another example. Some metals react much more readily; for example, copper is far more reactive than silver. Because of this higher reactivity, the chemical processes in the thin films which form on the surface of copper coins are far more complicated - although the way light interacts with them is the same. Aluminum is even more reactive, and will form a thin layer of aluminum oxide within fractions of a second. </p><p><br /></p><p>Thanks for all the kind words guys! Oh, and Doug, I didn't get too much into the science of Luster here, because I already treated the subject at length in another thread: <a href="http://www.cointalk.com/t58435/" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/t58435/">Luster: A Guide for Beginners</a>[/QUOTE]</p><p><br /></p>
[QUOTE="physics-fan3.14, post: 767539, member: 19165"]It is a similar idea. Basically, many metals will form layers on their surface (known as passivity). A bare metal will corrode quickly, but as this passive layer forms, the corrosion slows. Silver sulfide is an example, copper oxide is an example, rust (ferrous oxide) is another example. Some metals react much more readily; for example, copper is far more reactive than silver. Because of this higher reactivity, the chemical processes in the thin films which form on the surface of copper coins are far more complicated - although the way light interacts with them is the same. Aluminum is even more reactive, and will form a thin layer of aluminum oxide within fractions of a second. Thanks for all the kind words guys! Oh, and Doug, I didn't get too much into the science of Luster here, because I already treated the subject at length in another thread: [URL="http://www.cointalk.com/t58435/"]Luster: A Guide for Beginners[/URL][/QUOTE]
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