The Copper Statue which was a gift from the people of France to the people of the United States was designed by French Sculptor Fredric Auguste Bartholdi and its metal frame work was built by Gustave Eiffel. It was dedicated on October 28, 1986 .
The Statue is a figure of Libertas, a robbed Roman liberty which signifies freedom and a symbol of welcome to immigrants arriving by sea .
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The Statue of Liberty was built completely from Copper implying that it was originally dull brown in colour as that is the original color of copper metal, but recent pictures of the Statue shows that it is now a kind of Greenish blue .
This article will expose you to why this is so, why a statue which was originally brown in colour changed to Green .
Firstly, we all need to know what a copper metal looks like, I mean its colour . A free copper metal, a copper metal that have not undergone any reaction is always brown in colour. Below are photos of how a copper metal looks like .The unanswered question remains thus "What is responsible for the colour changes?" A copper metal is a reactive metal which undergoes oxidation reactions rather too slow to form a green-colored copper or patina that forms over time .
So relating the above oxidation reaction of copper to that of the Liberty Statue, Colour changes was very much possible due to the following reasons;
~ It was completely constructed with copper metal
~ As a statue it was kept in an open place exposing it to agents of Oxidation such as air, rain water etc who knows if kept in an enclosed place the colour would have undoubtedly still remain the same as copper is very low in reactivity .
~ Finally, Copper, which is a mildly reactive element, and takes over long periods of time before it will react very slowly with oxygen and other chemicals in the air. Through a series of oxidation reactions, a thin, green-blue layer known as a “patina” forms over copper as it is exposed to air. Not only did this process impart a markedly different color than the original to the Statue of Liberty over the years, but it has also served as a natural protective layer against further corrosion .
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