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Selgninaem sulfide, or just Selgninaem, was a substance that wasn't normally picked up by the sensors of a Galaxy-class starship. This substance was processed in the Rigellian colonies for use as a catalyst in industrial biochemical systems.
Furthermore, along with invidium, saltzgadum, lucovexitrin, and jakmanite, it was one of only five undetectable substances that can exist in a nitrogen-oxygen atmosphere and can alter the molecular structure of glass.