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The Statue of Liberty's copper has naturally oxidized to form its familiar "patina" green coating.
This patina is as thick, in many places, as the copper behind it and is protecting the copper from naturally wearing away.
Statue of Liberty Trivia:

Patina - Wikipedia

en.wikipedia.org/wiki/Patina

Patina is a thin layer that variously forms on the surface of stone; on copper, bronze and similar ... The Statue of Liberty gets its green color from the natural patina formed on its copper surface...

Why Is the Statue Of Liberty Green? | Wonderopolis

wonderopolis.org/wonder/why-is-the-statue-of-liberty-green

The amount of copper in the Statue of Liberty could make 30 million pennies! ... Over the next 30 years, though, it slowly turned to the green color you see today.

Why is the Statue of Liberty Green? · How Tall is the Statue of Liberty?

www.howtallisthestatueofliberty.org/why-is-the-statue-of-liberty-green/

The Statue of Liberty is coated with a thin layer of copper, which turns a blue- green with age due to chemical reactions between metal and water. This process is ...

Why is the Statue of Liberty Green? - Science Sparks

www.science-sparks.com/2012/05/25/why-is-the-statue-of-liberty-green-copper-chemistry/

May 25, 2012 ... The Statue of Liberty is an iconic landmark situated in New York, America. When asked to describe the appearance of the Statue of Liberty, ...

www.ask.com/youtube?q=Why Is the Statue of Liberty Green?&v=0R5ejcO2cgQ
Jul 28, 2013 ... Time lapse of pennies turning green! ... The Statue of Liberty for Kids: Famous World Landmarks for Children - FreeSchool - Duration: 4:42.

Why Is the Statue of Liberty Green? - Chemistry - About.com

chemistry.about.com/od/colorchemistry/fl/Why-Is-the-Statue-of-Liberty-Green.htm

Nov 21, 2016 ... The Statue of Liberty is a famous landmark with an iconic blue-green color. However, it wasn't always green. When the Statue was unveiled in ...

Why is the Statue of Liberty Blue-Green? - WSKC

www.wskc.org/documents/281621/282063/ENGAGE_E3S_Chemistry_Statue of Liberty.pdf/e4f24c7e-3666-425e-9c41-7dbdd0065eb4

The Statue of Liberty gets its blue-green color from patina formed on its copper surface ... patina contains a mixture of 3 compounds: Cu4SO4(OH)6 in green; ...

The Statue of Liberty Before It Was Green - Visual News

www.visualnews.com/2011/09/02/the-statue-of-liberty-before-it-was-green/

Sep 2, 2011 ... Did it ever occur to you that the official greeter of New York, the Statue of Liberty, wasn't always green? Constructed in Paris in the 1880's, the ...

The Statue of Liberty's Beguiling Green - The New Yorker

www.newyorker.com/magazine/2016/09/19/the-statue-of-libertys-beguiling-green

Sep 19, 2016 ... Recently I've been thinking about the color of the Statue of Liberty. That elusive, flickering, familiar, sea-polished shade of copper-green got into ...