Black annealed wire when produced correctly is black in color. Dark annealed(soft) wire is available on or without spools ranging from 0.85 to 095mm. Black annealed wire is fully softened low carbon steel wire having SWR 14 grade. The finish is termed either 'Black' or 'Grey' depending on the amount of oxide on the wire surface. Black annealed wire also known as annealed iron wire or annealed wire used by . Construction . Sugar mill for bagasse bailing . Textile mill or cotton bailing . Heat treatment plants.