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Copper oxide is basic in nature.Lemon or tamarind is acidic.Hence, when we rub tarnished copper vessel with lemon juice or tamarind, the basic copper oxide reacts with acid(citric acid) present in the lemon or tamarind to form a salt which is washed away with water.Hence,the vessel gets cleaned.

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13y ago

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CNN.com has an article about spring cleaning and they say to use a tablespoon of salt &1 cup of white vinegar added to boiling water to clean tarnished copper.


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