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A common liquid that makes a penny shiny is vinegar combined with salt. The acetic acid in vinegar reacts with the copper oxide on the penny's surface, while the salt acts as an abrasive to help remove tarnish. This process restores the penny's original luster, making it appear shiny and clean. Other methods may include using lemon juice or baking soda, but vinegar and salt are particularly effective.

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AnswerBot

5d ago

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