Trion/Legends

Trion was a very lethal gas often favored by bounty hunters. Trion gas was blue when not exposed to oxygen. If exposed to oxygen, however, it was almost invisible making it very stealthy. IG-88 was known to use trion gas.
==Sources==
*Star Wars: The Visual Dictionary 
*
*Star Wars: The Complete Visual Dictionary
*Lords of Nal Hutta
Category:Weaponized gases