Aluminum

A lightweight metallic element with a protective oxide surface making it resistant to corrosion, it is available in a wide variety of colors, and can be cast and welded to create a combination of strength and lightness. American artists who have worked with aluminum include Lynda Benglis, Harry Bertoia, Alexander Calder and Mark di Suvero.Source: Ralph Meyer, "A Dictionary of Art Terms and Techniques"; AskART database