Why Statue of Liberty is colored green?
Significance
The Statue of Liberty represents Libertas, the Roman goddess. She holds a torch above her head, and in her left arm possesses tablet inscribed "July 4, 1776", the date of the American Declaration of Independence.
When the statue was originally assembled, it was a dreary brown colour, reflecting the natural colour of its copper plates. Over the next 30 years, it slowly looked to the iconic blue-green colour.
How did its color change?
The outer surface of Statue of Liberty is covered with thin copper sheets. Copper reacts with air to form verdigris. This is known as oxidation in science.
Why don't they clean it?
The verdigris works as a shield to the statue from New York's high wind, salt water and air pollution. Means, cleaning isn't a good idea as it is harmful for the statue than good.
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