Oh that blowtorch.
Methylated spirits for ignition.
My Dad had one, and I vaugely remember, that as a young child the blood* thing ignited in his face, and my Mother screaming and wrapping him in wet tea towels.
I don’t know if he went to hospital or what the injuries were, but (much later on), no scarring evident.
ps. Great thread by the way. My kids are going to ask what is all this stuff in Dads workshop – tap, dies, precision marking out tools, measuring instruments, surface table, spanners, power tools, stocks of collected timber, stocks of steel angle (re-cycled metal stillages containing Japanese motorcycles – The dealers just chucked it all out and more.