OHMatt's lighter fluid: isoButane

[Wharf Rat]

A butane / propane mixture will have several times the pressure within its storage tank as butane alone. This alone means that there will be considerably more energy (BTUs in English units) coming out of the orifice. So:

a/ users should be careful since it may produce a much longer flame.
b/ try turning down the flame, if its adjustable.

Bob