ORIGINAL: hendrix_gr
I use a propane blow torch bottle (US imported) which says
propadiene something. (they use the chemical term rather than plain language)
That sounds like MAPP gas which is *not* propane.
It burns much hotter (almost as hot as acetylene) and also releases a lot of carbon (soot) if not burnt at a proper stoiometric ratio.
I'd strongly recommend going to a proper propane/butane (LPG) mix.