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The production of black annealed iron wire begins with high-carbon steel wire rods. These rods are heated and then allowed to cool in a controlled environment, a process known as annealing. This process not only improves the ductility of the wire but also reduces its hardness, making it easier to work with. The black color of the wire comes from the coating of iron oxide that forms during the manufacturing process, which provides a degree of corrosion resistance.