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In page Aluminium:

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Aluminium metal has an appearance ranging from silvery white to dull gray depending on its surface roughness.[a] Aluminium mirrors provides high reflectivity for light in the ultraviolet, visible (on par with silver),[3] and the far infrared region.[4] Aluminium is also good at reflecting solar radiation, although prolonged exposure to sunlight in air can deteriorate the reflectivity of the metal;[5] this may be prevented if aluminium is anodized, which adds a protective layer of oxide on the surface.[citation needed]