This powder used to thicken gasoline was introduced in WWII
[DOC] [TLE] Napalm Exposure: Background, Epidemiology - Medscape Reference [PAR] Jan 14, 2016 ... ... powder, composed of naphthalene and palmitate (hence "napalm"), to 
gasoline in ... Napalm has been used primarily in the form of incendiary bombs, 
firebombs, ... of flamethrowers, which were frequently used in World War II.