Poling process is used
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Poling is a method of purification of copper which contains copper oxide as an impurity and also in the purification of tin which contains tin oxide as an impurity.
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Poling is a method used to purify metals that have oxidized impurities. It is typically used to purify metals like copper or tin that are in the impure form of a copper oxide or tin oxide. A log of wood which is still green is used to stir the liquid metal. The hydrocarbons in the green wood can reduce the metal & the oxygen leaves as CO2 gas.
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