David Lesher wrote
JP-4, long gone, had all kinds of nasties like toluene, naphtha,
etc added. AFAIK, it was never used in civilian aircraft.

JP-4 was sold to the civilian market as Jet B and is still
available in some markets.


From this web site:
http://www.epa.gov/docs/fedrgstr/EPA...997/April/Day-
03/g8495.htm

The flammability region of Jet B (JP-4), another fuel approved for
use on most commercial transport category airplanes but primarily
used for military jets,

Bob Moore
PanAm (retired)