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| An illustration of a "Then & Now" look at Lady Liberty's transformation. |
For her first few decades in New York Harbor, Lady Liberty was a bright, shiny reddish-brown. However, because she is exposed to the harsh salt air and moisture of the Atlantic, a chemical process called oxidation began almost immediately.
By 1906, the copper had reacted with the elements to form a thin protective layer called a patina. By 1920, she had turned entirely green. While Congress originally discussed painting the statue to "fix" the corrosion, the Army Corps of Engineers insisted the green layer actually protected the metal from further decay.
The Engineering Under the Copper
While we focus on her copper exterior, the interior is a marvel of 19th-century engineering. The sculptor, Frédéric Auguste Bartholdi, collaborated with Gustave Eiffel to create a massive iron pylon and secondary skeletal framework. This allowed the statue's copper skin to move independently during the high winds of the harbor—a process called thermal expansion. This flexible design is why she has survived over 135 years of storms and salt air.A Symbol of Chemistry and Freedom
The transition from red to green wasn't just an aesthetic change; it was a complex series of chemical reactions. When copper is exposed to oxygen, it forms cuprite (pink/red), then tenorite (black), and finally the green carbonates we see today. This patina is only about 0.005 inches thick, but it is so durable that the statue has never needed to be repainted or "restored" to its original color."Why is the Statue of Liberty Green?" — Field Research Footage
Fast Fact:Lady Liberty's torch is the only part that isn't green! While the original 1886 torch was copper, it was replaced in 1986 with a new version covered in 24k gold leaf so it would shine as a beacon, just as the sculptor Frédéric Auguste Bartholdi originally intended.
Source(s): American Chemical Society | Statue of Liberty & Ellis Island Foundation
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