Underworld Boss Dye Module
The Underworld Boss Dye Module originally could be found on the Cartel Market, Cartel Packs or Dye Packs. Due to the random nature of Cartel Packs and Dye Packs, there is a low chance of receiving any specific dye from these packs, it is recommended to instead buy the Underworld Boss Dye Module from the GTN from other players. This dye can also be bought directly from the Cartel Market for 240 CC.
When you use the Underworld Boss Dye Module, it will dye the primary dye section of your armor Underworld Black, and the secondary part of your armor Underworld Deep Brown.
All dye modules are one-use, so once you've added a Underworld Boss Dye Module to your armor, you will not be able to remove it and reuse it later.
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Comparison of Similar Dyes
These dyes are not quite the same as the Underworld Boss Dye Module, but they have either Black or Brown in them. The Underworld Boss Dye Module preview is on the left, and the other potentially similar dye is on the right.