Why is the Statue Green?

Why is the Statue Green? (HMX9B)

Location: New York, NY 10004 New York County
Country: United States of America

N 40° 41.342', W 74° 2.736'

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Inscription
The answer is in the air.

The Statue's skin is made of copper, and when copper is exposed to oxygen in the air, it undergoes a chemical reaction called oxidation. The reaction causes a fine crust or film to develop that is usually green in color. This layer protects the original metal underneath. In copper and bronze, this natural protective process is called Patination. It took nearly thirty years for the Statue to turn from her original copper color to the green you see today. The palination process can also be observed on buildings where copper or bronze are used for roofing and ornamentation such as the ferry dock on Liberty Island and on the roof and domes of the Immigration Station at Ellis Island.
Details
HM NumberHMX9B
Tags
Placed ByNational Park Service
Marker ConditionNo reports yet
Date Added Wednesday, October 8th, 2014 at 8:58pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)18T E 580643 N 4504675
Decimal Degrees40.68903333, -74.04560000
Degrees and Decimal MinutesN 40° 41.342', W 74° 2.736'
Degrees, Minutes and Seconds40° 41' 20.52" N, 74° 2' 44.16" W
Driving DirectionsGoogle Maps
Area Code(s)212, 917, 646, 516, 347,
Closest Postal AddressAt or near 1 Liberty Island, New York NY 10004, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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