"Denatured alcohol" is alcohol not good to drink - either because
it is intrinsically poisonous or because it has been treated to
render it undrinkable - and the name is suposed to clue people in to
that fact, so they don't go around drinking shellac thinner etc.
Perversely, however, the name implies that there alcohol which is
"natural" to drink, (I suppose "natured") alcohol. And it may very
well be natural to drink the stuff - no judgement on my part is
implied. I do it often.
Anyway - to answer the question -
"Shellac thinner" is generally what the "denatured" name is applied
to - which also is sold by its own name "methanol" or under other
names such as "gas line de-icer" Same stuff at wildly different
prices. Ask for methanol or shellac thinner at the paint store. 20
NOT lacquer thinner, NOT paint thinner.
You probably can also use isopropyl (rubbing) alcohol but it often
contains 30% water which interferes with the burn-off.
Marty in Victoria BC