I honestly do not know, but it could be most anything even paper pulp will produce charcoal and when it is reburned under a much higher temperature of powder ignition it will produce smoke.

Remember charcoal is only listed in T7 - none of the surgar based products use it in their formulas.

But, to your question - again I would suggest you look at IMR White Hots - same powder as T7 without the two added ingredients and produces the same power as T7, actually IMR(hodgdon) says greater power but I have not seen anyone confirm that - that is the only proof that that I can offer...

And originally when T7 came out, Hodgdon said the same thing - they had to die the powder and add more smoke to make it appear to be more like real black powder.