FM, Fumigerite
Titanium tetrachloride (FM) is a colorless, highly refractory liquid that boils at 136 degrees C (277 degrees F). It reacts with the moisture in the air and will evolve into dense clouds of acrid white smoke with a total obscuring power (TOP) of 1900.
Old Chemical Weapons Reference Guide (1998)
TM 9-1904, Ammunition Inspection Guide (1944)