Black tungsten wire is simply tungsten wire that retains a black surface finish due to the presence of drawing lubricants and oxides. It’s commonly used in various applications, including incandescent lamp filaments, cathode and support structures for power tubes, and heating elements. 
 
Key aspects of black tungsten wire:
  • Surface Finish:
    The black color is due to the drawing process, where lubricants and oxides are retained on the surface
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