Copper pots heat steadily and evenly. To take advantage of this property, many aluminum or stainless steel pots are made with a layer of copper sandwiched into the bottom. But naked copper is a potentially poisonous metal. That's why copper pots are lined with tin or stainless steel. Whenever you cook with copper, periodically check the lining of the pot. If it's damaged — meaning that you can see the orange copper peeking through the silvery lining — have the pot relined or throw it out.

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