Terry fired this volley in
:

Probably hexamine. High nitrogen content, lots of heat, burns clean,
no ashes. Still used for fuel tablets, check ebay.

http://en.wikipedia.org/wiki/Hexamine

The tabs are kind of pricey from the usual camping/mountaineering
supplies, but you can buy bags of hexamine and press your own with a
homemade tabletting press (similar to a cheese press) for about $3.00 per
pound. Or, it can be melted (hotter than wax) and just poured into
moulds.

Hexamine is a flammable subtance, but not otherwise regulated as HazMat.
We use it as a low-energy fuel in compositions that must burn cleanly and
cool.

LLoyd