Metals are some of the toughest materials out there. From the body of your car to the roof over your head, you are sure to find strong objects made out of them. Of course, metals are not impervious to wear and tear. If a certain metal has iron in it, exposure to water and oxygen will cause it to oxidize, a process more commonly known as rusting. And when rust begins forming, degradation is sure to follow. But what if like people, certain metals can age gracefully? Such is the case with brass, an alloy made from combining copper and zinc. Since it contains no iron, rusting won’t ever be a concern. More importantly, exposure to the elements can actually make it look more appealing.
http://www.rotaxmetals.net/brass-sheet-metal-the-science-behind-the-patination-process-explained/
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