Does Copper Rust?
Last Updated Apr 8, 2020 4:17:53 AM ET
Copper undergoes a process much like rusting. When exposed to air for extended periods of time, copper oxidizes in a way similar to how iron forms rust. When copper oxidizes, certain chemical reactions form a light green layer over the copper.
Oxidization is the process that has given the Statue of Liberty its distinctive green color, which is known as a patina. Oxidization is also the reason the roofs of many older buildings are green. In addition to changing copper's color, the patina creates a protective, waterproof layer over it, which helps to keep the metal underneath from being further damaged by the elements.
More From Reference
What Are the Steps of Presidential Impeachment?
What Does George Soros' Open Society Foundations Network Fund?
The History of the United States' Golden Presidential Dollars
How the COVID-19 Pandemic Has Changed Schools and Education in Lasting Ways
Fact Check: Is the COVID-19 Vaccine Safe?
How Does the 25th Amendment Work — and When Should It Be Enacted?