when in fact it could just be heating oil KEROSENE 28sec.
Not likely. Jet A and I assume other jet aircraft fuels often contain additives which I doubt are in kerosene or heating oil. One of these is an antimicrobial agent to prevent flora from sprouting in your fuel system - a very expensive proposition and a possible safety hazard. Another is an anti icing agent (Prist is a common brand name); some helicopters require this and others do not so it is often added as the acft is fueled. There may be others as well. Life is complicated - go with it!
