Day: January 24, 2017

Bronze Disease: Even Metal Gets Sick

Posted on 24 January 2017 by Aliza Taft

We are all familiar with the pleasing shininess of a new copper penny, and with how quickly this color becomes dull and matte simply from everyday use. This flat brown color doesn’t appear because the penny gets covered with dirt; rather, the copper surface has undergone a fundamental chemical change.  The copper in the penny
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