Wikipedia There is more information available on this subject at Benzene on the English Wikipedia.

Benzene, or Benzol or Benzine, is an organic chemical compound with the formula C6H6. It is sometimes abbreviated Ph-H. Benzene is a colorless and highly flammable liquid with a sweet smell and a relatively high melting point. Because of this, its use as an additive in gasoline is now limited, but it is an important industrial solvent and precursor in the production of drugs, plastics, synthetic rubber, and dyes. Benzene is a natural constituent of crude oil, but it is usually synthesized from other compounds present in petroleum. Benzene is an aromatic hydrocarbon and the second [n]-annulene ([6]-annulene), a cyclic hydrocarbon with a continuous pi bond.

The chemical is considered a recreational drug by Grunts, referred to as "Lovely lung gold" and a "sacred aromatic," and seems to be perfectly tolerable to Grunt biology.[1]


  1. Halo: Ghosts of Onyx, page 237