Lemon or tamarind is used for cleaning copper vessels turned greenish.

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Detailed Solution

The above statement is true.
●        Copper carbonate is created when copper and airborne carbon dioxide react.
●        As a result, copper loses its glossy brown surface and develops a coating of copper carbonate that is green in colour.
●        The layer dissolves when the citric acid in lemons or tamarind neutralises the base copper carbonate.
●        To restore the lustre to the copper vessel's surface, tarnished copper vessels are washed with lemon or tamarind juice.

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