America's statue of liberty is blue-green in colour . When it was unveiled , it was not green in colour but was of shiny brown colour.
The reason why statue of liberty changed the colour is that the outer surface of statue is covered with hundreds of thin copper sheets . Copper reacts with air which is known as oxidation reaction to form cuprus oxide ,which is green in colour.
This oxide has formed a layer that protects the underlying metal from corrosion and degradation . So it is a blessings in disguise !
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