Things You Will Need
The secret is rusting the metal without hurting yourself.
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Put on thick gloves when handling the barbed wire to prevent cuts and other injuries.
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Scrub the barbed wire with a steel wool pad or scrubbing brush. This roughens the surface and also removes any rust-proof coating that is on the wire.
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Fill a large container or bucket with water. Add the barbed wire. Water is the most important ingredient for rusting metal.
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Add two to three tbsp. of salt to the water. A salt solution accelerates rusting.
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Leave the barbed wire in the saltwater for several hours.
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Remove the wire from the water, and place it on a surface covered with paper towels.
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Carry the barbed wire and paper towels outdoors into the sun. The heat accelerates the rusting. Make certain no children or animals can access the barbed wire.
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Repeat Steps 3 through 7 until you get the desired amount of rust on the barbed wire.