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I believe it is a very thin aluminum lining which commonly stains towel when wiped!
Sorry, there was a problem. Please try again later.Hi Archeryhunter, It is made of aluminum. We highly advise you to wash the inside with a damp, warm cloth and a baking soda solution (two tablespoons in a quart of water), then wipe dry with a dry cloth. Shai | Insignia Support https://www.bestbuy.com/insignia
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