I know this use is unconventional and maybe not too relevant to
metalwork, hopefully that doesn't **** anyone off.

I want to apply soot deposits to glass in a swirl pattern. I've used
pure acetylene to do this before on other surfaces, it produces long
strands of soot that float through the air and make an interesting
pattern when they land on something. Hard to control but looks
interesting.

I no longer have acetylene, I don't know if it's available anywhere in
small tanks, like propane or MAPP is? Are there any other gases that
will burn and produce smoke like acetylene? I need maybe 2 minutes
worth of gas so I really don't want to buy/lease a tank and pay near
$100. I can't transport the gas to another shop either.

HS