Ah, I see. They are using methylated spirits - a 10/90 to 50/50 mix of methanol and ethanol, with some bitters (denatonium). Alcohols burn hotter than paraffins because of their short chain length and oxygen group, but are necessary to carry the highly polar salts in solution.
This stuff doesn't burn nearly as hot, and I would be getting the salts into solution via essentially a soap - fatty acid/metal cation complex.
You'd still have an issue with salt residue - although this would probably wash off. I dunno, I've yet to make this stuff in any large quantity, let alone test it.
Is there an interest in colored flames that don't eat wicks as fast? I could probably design a fuel for that purpose, too, it would likely be cheaper than the stuff for
Fire Breathing, and cheaper to ship, since it isn't a hazmat like alcohols.