Core solders are manufactured with the solder wire as a tube and the centre of the tube contains the flux. Rosin core solder contains a mild flux and is designed to solder parts where flux residue cannot be removed. Resin or flux core solder is used when soldering copper that is slightly tarnished. The flux cleans the surface of oils and contaminates and prevents oxidation until it cools off. Many companies wash off the flux with alcohol or toluene or a mixture of the two.
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