Hot Head torch and bulk fuel butane?

[Redhotsal]

The butane will melt the glass but you will have trouble keeping the colours "true" - i.e. most of the glass will reduce to some extent or other. The butane will also burn "dirtier" than propane so you'll have lots of black/grey deposits. Sorry about that. Try and get some propane, it should be available, you only need a small "tank" or bottle of it 3.9kg is the minumum but will do fine - it's stacks better and you shouldn't have too mauch of a problem getting hold of it.
Sal

[Ibeadza]

Thanks for the advice. Clearly you can not use bulk fuel butane with the Hot head torch. I also asked on the Wet canvas forum and for anyone interested in a more technical explanation, here is the link. 

http://www.wetcanvas.com/forums/showthread.php?t=410867

The search for propane continues!