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Name: Tim
Status: Student
Grade: 9-12
Location: TX
Country: USA
Date: April 2006

Why are cast iron cook-ware black in color? Iron is silver colored. Iron oxide is reddish. What is the composition of the black iron?

Hi, David.

Cast iron contains carbon, which makes it appear slightly different from pure iron, but the main reason the cookware is black is that cast iron cookware takes on a patina from the cooking, both from the food and the heat. This deepens the color to black. New cast iron cookware has the gray color.

David Brandt, P.E.

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